diff --git a/front-end-tools/CHANGELOG.md b/front-end-tools/CHANGELOG.md
index 8a29dae5..880df5a0 100644
--- a/front-end-tools/CHANGELOG.md
+++ b/front-end-tools/CHANGELOG.md
@@ -1,5 +1,10 @@
 ## Unreleased changes
 
+- Fix error message when specifying input parameter without uploading schema.
+- Fix error when contract calls return BigInts.
+- Fix contract method names in error messages.
+- Give warning when deploying a module that does not have embedded build information.
+
 ## 3.0.1
 
 - Upgrade dependencies @concordium/web-sdk and @concordium/react-components
diff --git a/front-end-tools/package.json b/front-end-tools/package.json
index 83b65f62..7368a510 100644
--- a/front-end-tools/package.json
+++ b/front-end-tools/package.json
@@ -9,6 +9,7 @@
     "dependencies": {
         "@concordium/react-components": "^0.4.0",
         "@concordium/web-sdk": "^7.1.0",
+        "json-bigint": "^1.0.0",
         "moment": "^2.29.4",
         "react": "^18.1.0",
         "react-bootstrap": "^2.7.4",
@@ -18,6 +19,7 @@
         "react-switch": "^7.0.0"
     },
     "devDependencies": {
+        "@types/json-bigint": "^1",
         "@types/node": "^18.7.23",
         "@types/react": "^18.0.9",
         "@types/react-dom": "^18.0.5",
diff --git a/front-end-tools/src/Main.tsx b/front-end-tools/src/Main.tsx
index 3d7f88fa..e95954a6 100644
--- a/front-end-tools/src/Main.tsx
+++ b/front-end-tools/src/Main.tsx
@@ -78,13 +78,13 @@ export default function Main(props: ConnectionProps) {
         <main className="container">
             <div className="textCenter">
                 <br />
-                {activeConnectorError && <Alert variant="dager">Connector Error: {activeConnectorError}.</Alert>}
+                {activeConnectorError && <Alert variant="danger">Connector Error: {activeConnectorError}.</Alert>}
                 {!activeConnectorError && activeConnectorType && !activeConnector && (
                     <p>
                         <i>Loading connector...</i>
                     </p>
                 )}
-                {connectError && <Alert variant="dager">Connect Error: {connectError}.</Alert>}
+                {connectError && <Alert variant="danger">Connect Error: {connectError}.</Alert>}
                 {!isConnected && (
                     <button
                         className="btn btn-primary me-1"
diff --git a/front-end-tools/src/components/DeployComponent.tsx b/front-end-tools/src/components/DeployComponent.tsx
index 64bdfdec..39b47821 100644
--- a/front-end-tools/src/components/DeployComponent.tsx
+++ b/front-end-tools/src/components/DeployComponent.tsx
@@ -56,6 +56,7 @@ export default function DeployComponenet(props: ConnectionProps) {
 
     const [transactionErrorDeploy, setTransactionErrorDeploy] = useState<string | undefined>(undefined);
     const [uploadError, setUploadError] = useState<string | undefined>(undefined);
+    const [isReproducibleBuild, setIsReproducibleBuild] = useState<boolean | undefined>(undefined);
     const [isModuleReferenceAlreadyDeployedStep1, setIsModuleReferenceAlreadyDeployedStep1] = useState(false);
     const [txHashDeploy, setTxHashDeploy] = useState<string | undefined>(undefined);
     const [base64Module, setBase64Module] = useState<string | undefined>(undefined);
@@ -131,7 +132,7 @@ export default function DeployComponenet(props: ConnectionProps) {
                     <Form.Label>Upload Smart Contract Module File (e.g. myContract.wasm.v1)</Form.Label>
                     <Form.Control
                         type="file"
-                        accept=".wasm,.wasm.v0,.wasm.v1"
+                        accept=".wasm,.v0,.v1"
                         {...form.register('file')}
                         onChange={async (e) => {
                             const register = form.register('file');
@@ -220,6 +221,13 @@ export default function DeployComponenet(props: ConnectionProps) {
                                     );
 
                                     setEmbeddedModuleSchemaBase64Init(moduleSchemaBase64Embedded);
+
+                                    // Check if the module was built as a reproducible build.
+                                    const buildInfoSection = WebAssembly.Module.customSections(
+                                        wasmModule,
+                                        'concordium-build-info'
+                                    );
+                                    setIsReproducibleBuild(buildInfoSection.length !== 0);
                                 } else {
                                     setUploadError('Upload module file is undefined');
                                 }
@@ -229,6 +237,14 @@ export default function DeployComponenet(props: ConnectionProps) {
                     <Form.Text />
                 </Form.Group>
                 {uploadError !== undefined && <Alert variant="danger"> Error: {uploadError}. </Alert>}
+                {isReproducibleBuild === false && (
+                    <Alert variant="warning">
+                        Warning: The module does not have embedded build information. It will likely not be possible to
+                        match this module to source code. See the{' '}
+                        <a href="https://docs.rs/crate/cargo-concordium/latest">cargo-concordium documentation</a> for
+                        more information.
+                    </Alert>
+                )}
                 <br />
                 {base64Module && moduleReferenceCalculated && (
                     <>
diff --git a/front-end-tools/src/components/ReadComponent.tsx b/front-end-tools/src/components/ReadComponent.tsx
index 36633794..bc7bdd9b 100644
--- a/front-end-tools/src/components/ReadComponent.tsx
+++ b/front-end-tools/src/components/ReadComponent.tsx
@@ -96,12 +96,12 @@ export default function ReadComponenet(props: ConnectionProps) {
                 throw new Error('Set smart contract name');
             }
 
-            let schema = '';
-
-            const schemaFromModule = deriveContractInfo ? embeddedModuleSchemaBase64 : uploadedModuleSchemaBase64;
-
-            if (schemaFromModule !== undefined) {
-                schema = schemaFromModule;
+            const schema = deriveContractInfo ? embeddedModuleSchemaBase64 : uploadedModuleSchemaBase64;
+            if (schema === undefined) {
+                setSchemaError(
+                    'Schema was not uploaded or not embedded into the module. Uncheck the "Derive From Smart Contract Index" checkbox to manually upload a schema or uncheck "Has Input Paramter" checkbox if this entrypoint has no input parameter'
+                );
+                return;
             }
 
             const readFunctionTemplate = getUpdateContractParameterSchema(
diff --git a/front-end-tools/src/components/UpdateComponent.tsx b/front-end-tools/src/components/UpdateComponent.tsx
index dbb6ada4..d205d2c8 100644
--- a/front-end-tools/src/components/UpdateComponent.tsx
+++ b/front-end-tools/src/components/UpdateComponent.tsx
@@ -141,12 +141,12 @@ export default function UpdateComponenet(props: ConnectionProps) {
                 throw new Error('Set smart contract name');
             }
 
-            let schema = '';
-
-            const schemaFromModule = deriveContractInfo ? embeddedModuleSchemaBase64 : uploadedModuleSchemaBase64;
-
-            if (schemaFromModule !== undefined) {
-                schema = schemaFromModule;
+            const schema = deriveContractInfo ? embeddedModuleSchemaBase64 : uploadedModuleSchemaBase64;
+            if (schema === undefined) {
+                setSchemaError(
+                    'Schema was not uploaded or not embedded into the module. Uncheck the "Derive From Smart Contract Index" checkbox to manually upload a schema or uncheck "Has Input Paramter" checkbox if this entrypoint has no input parameter'
+                );
+                return;
             }
 
             const functionTemplate = getUpdateContractParameterSchema(
diff --git a/front-end-tools/src/reading_from_blockchain.ts b/front-end-tools/src/reading_from_blockchain.ts
index 192c7b0b..9850f75e 100644
--- a/front-end-tools/src/reading_from_blockchain.ts
+++ b/front-end-tools/src/reading_from_blockchain.ts
@@ -15,7 +15,7 @@ import {
     Parameter,
     ReturnValue,
 } from '@concordium/web-sdk';
-
+import JSONbig from 'json-bigint';
 import { CONTRACT_SUB_INDEX } from './constants';
 
 /** This function gets the contract info of a smart contract index. */
@@ -157,25 +157,27 @@ export async function read(
         parameter: param,
     });
 
+    const fullEntryPointName = `${contractName.value}.${entryPoint.value}`;
+
     if (!res || res.tag === 'failure') {
         const rejectReason = JSON.stringify(
             ((res as InvokeContractFailedResult)?.reason as RejectedReceive)?.rejectReason
         );
 
         throw new Error(
-            `RPC call 'invokeContract' on method '${contractName}.${entryPoint}' of contract '${contractIndex}' failed.
+            `RPC call 'invokeContract' on method '${fullEntryPointName}' of contract '${contractIndex}' failed.
             ${rejectReason !== undefined ? `Reject reason: ${rejectReason}` : ''}`
         );
     }
     if (!res.returnValue) {
         throw new Error(
-            `RPC call 'invokeContract' on method '${contractName}.${entryPoint}' of contract '${contractIndex}' returned no return_value`
+            `RPC call 'invokeContract' on method '${fullEntryPointName}' of contract '${contractIndex}' returned no return_value`
         );
     }
 
     if (moduleSchema === undefined) {
         // If no schema is provided return the raw bytes
-        return JSON.stringify(res.returnValue);
+        return JSONbig.stringify(res.returnValue);
     }
 
     let returnValue;
@@ -190,15 +192,15 @@ export async function read(
         );
     } catch (e) {
         throw new Error(
-            `Deserializing the returnValue from the '${contractName}.${entryPoint}' method of contract '${contractIndex}' failed. Original error: ${e}`
+            `Deserializing the returnValue from the '${fullEntryPointName}' method of contract '${contractIndex}' failed. Original error: ${e}`
         );
     }
 
     if (returnValue === undefined) {
         throw new Error(
-            `Deserializing the returnValue from the '${contractName}.${entryPoint}' method of contract '${contractIndex}' failed.`
+            `Deserializing the returnValue from the '${fullEntryPointName}' method of contract '${contractIndex}' failed.`
         );
     } else {
-        return JSON.stringify(returnValue);
+        return JSONbig.stringify(returnValue);
     }
 }
diff --git a/front-end-tools/yarn.lock b/front-end-tools/yarn.lock
index f35370da..0abcfadb 100644
--- a/front-end-tools/yarn.lock
+++ b/front-end-tools/yarn.lock
@@ -1342,6 +1342,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/json-bigint@npm:^1":
+  version: 1.0.4
+  resolution: "@types/json-bigint@npm:1.0.4"
+  checksum: bb567bac8d64f541abb3cb716d5c699c460b9aa4a9fc5fc81a3cee9cb57fe8c03914022049dcdadff213972979a5d08267405d55d2ed6aa95d3558f08347008a
+  languageName: node
+  linkType: hard
+
 "@types/json-schema@npm:^7.0.9":
   version: 7.0.15
   resolution: "@types/json-schema@npm:7.0.15"
@@ -3625,6 +3632,7 @@ __metadata:
   dependencies:
     "@concordium/react-components": "npm:^0.4.0"
     "@concordium/web-sdk": "npm:^7.1.0"
+    "@types/json-bigint": "npm:^1"
     "@types/node": "npm:^18.7.23"
     "@types/react": "npm:^18.0.9"
     "@types/react-dom": "npm:^18.0.5"
@@ -3640,6 +3648,7 @@ __metadata:
     eslint-plugin-jsx-a11y: "npm:^6.5.1"
     eslint-plugin-react: "npm:^7.29.4"
     eslint-plugin-react-hooks: "npm:^4.4.0"
+    json-bigint: "npm:^1.0.0"
     moment: "npm:^2.29.4"
     prettier: "npm:^3.1.0"
     process: "npm:^0.11.10"