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An error occurred while starting the application.
.NET Core <version> | Microsoft.AspNetCore.Hosting <version> | Microsoft Windows <version> | Need help?"><meta name=author content="George Kosmidis"><meta http-equiv=Content-Security-Policy content="script-src 'nonce-fc0cbc39-3c5d-4ed9-824e-538366c81ad4'"><link rel=me type=text/html href=https://github.com/georgekosmidis><link rel=me type=text/html href="https://www.linkedin.com/in/georgekosmidis/"><link rel=me type=text/html href=https://www.youtube.com/c/GeorgeKosmidis><link rel=me type=text/html href="https://sessionize.com/georgekosmidis/"><link rel=me type=text/html href="https://www.meetup.com/munich-dotnet-meetup/members/202480733/profile/"><link rel=me type=text/html href="https://georgekosmidis.net/"><link rel=icon type=image/jpg href=/media/me_180x180.jpg><link rel=apple-touch-icon type=image/jpg sizes=180x180 href=/media/me_180x180.jpg><meta property=og:title content="Publishing ASP.NET Core: An error occurred while starting the application"><meta property=og:type content=article><meta property=og:url content=https://blog.georgekosmidis.net/publishing-asp-net-core-an-error-occurred-while-starting-the-application.html><meta property=og:image content=https://blog.georgekosmidis.net/media/100190-feature.png><meta property="og:description " content="Have you seen this error?
An error occurred while starting the application.
.NET Core <version> | Microsoft.AspNetCore.Hosting <version> | Microsoft Windows <version> | Need help?"><meta property=og:article:published_time content="06/08/2018 10:23:02"><meta property=og:article:modified_time content="07/26/2020 09:09:49"><meta property=og:article:expiration_time content="12/31/9999 23:59:59"><meta property=og:article:author content="George Kosmidis"><meta property=og:article:section content=""><meta property=og:article:tag content=" ASP.NET Core, Swagger, Web API"><link href=https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css rel=stylesheet integrity=sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3 crossorigin=anonymous><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/cookieconsent@3.1.1/build/cookieconsent.min.css integrity="sha256-zQ0LblD/Af8vOppw18+2anxsuaz3pWYyVWi+bTvTH8Q=" crossorigin=anonymous><link rel=stylesheet href=https://cdn.jsdelivr.net/npm/@highlightjs/cdn-assets@11.4.0/styles/vs2015.min.css integrity="sha256-Pi771++jBrwgeHVYGOa1sjN8idXlrrYSKQVI7+JA54k=" crossorigin=anonymous><title>Publishing ASP.NET Core: An error occurred while starting the application</title><style>header{background-image:url(/media/header_bg.jpg);background-size:cover;background-position:100% 100%}header svg{width:25px;fill:#f8f9fa}footer svg{width:25px;fill:black}.me{width:180px;height:180px}.article{overflow-wrap:break-word;word-wrap:break-word;-ms-word-break:break-all;word-break:break-all;word-break:break-word}.article img{max-width:100%;height:auto}h1,h2,h3,h4,h5,h6{font-weight:400}h2{margin-top:4rem}.right-column-container h2,.index-card-wrapper h2{margin-top:0}.h3,h3{margin-top:3rem;font-size:1.65rem}.h4,h4{font-size:1.4eem}.h5,h5{font-size:1.2eem}.h4,.h5,h4,h5{margin-top:2rem}th,strong,b{font-weight:500}a{text-decoration:none}a:hover{text-decoration:underline}a.btn svg{margin-bottom:3px}.article-google-engine-top,.article-google-engine-left{display:none}@media (min-width:992px){.container{max-width:1200px}header > .container{max-width:768px}.article-google-engine-left{display:block}td{padding:10px}}@media (max-width:991.98px){.container{padding-right:calc(var(--bs-gutter-x) * .3);padding-left:calc(var(--bs-gutter-x) * .3)}.article-google-engine-top{display:block}td{padding:5px 2px 5px 2px}}blockquote{text-rendering:optimizelegibility;font-weight:400;line-height:160%;box-sizing:inherit;background-color:#DEEBFF;outline-color:#171717;color:#171717;word-wrap:break-word;word-break:break-word;border:1px solid #DEEBFF;border-radius:.375rem;margin-top:1rem;padding:1rem;font-size:1rem;transition:height .5s ease-in,opacity .5s ease-in;display:block;position:relative}blockquote p{margin-bottom:0}dfn{border-color:#343a40}</style><script async src="https://www.googletagmanager.com/gtag/js?id=UA-3071108-41" nonce=fc0cbc39-3c5d-4ed9-824e-538366c81ad4></script><script nonce=fc0cbc39-3c5d-4ed9-824e-538366c81ad4>window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}
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An error occurred while starting the application.
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application"> </div> </div> <div class=row> <div class="col pt-3 pb-6"> <p>Have you seen this error? <br> <code>An error occurred while starting the application. .NET Core <version> | Microsoft.AspNetCore.Hosting <version> | Microsoft Windows <version> | <a href="https://docs.microsoft.com/el-gr/aspnet/core/host-and-deploy/azure-iis-errors-reference?view=aspnetcore-2.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Need help?</a> </code></p> </code> <br> <blockquote class="blockquote border border-danger p-3"> There is <strong>a newer version</strong> of this blog post!<br> Visit <a href="/an-error-occurred-while-starting-the-application-process-failure-and-many-more/">/an-error-occurred-while-starting-the-application-process-failure-and-many-more/</a> </blockquote> <p> It looks like this in your browser: <br> <figure class=figure> <img src=/media/100190-an_error_occured.png class="figure-img img-fluid rounded" alt="An error occurred while starting the application." title="An error occurred while starting the application."> <figcaption class="figure-caption text-right">An error occurred while starting the application.</figcaption></figure> </p> <p> Besides that one hint, that the error is while starting, it’s not very descriptive, right? </p> <p> Althouth there many things that could go wrong and the proper way is to actually troubleshoot the error, I end up googling about this for over an hour! In my search I found numerous articles but it turned out that for me the solution was simple!<br> </p> <blockquote>I forgot to configure the release output path for swagger :/</blockquote> <p>Probably you already know how to do this, but in case you don’t remember…:<br> Right click your project, then click <code>Properties</code>, then click the<code>Build</code> tab and at the <code>Output</code> section check the <code>XML documentation file</code>:<br> <figure class=figure> <img src=//media/100190-configure.png class="figure-img img-fluid rounded" alt="An error occurred while starting the application - Configuration" title="An error occurred while starting the application - Configuration"> <figcaption class="figure-caption text-right">An error occurred while starting the application - Configuration</figcaption></figure> </p> <p>And if configuring swagger wasn’t the solution, you can either check one of the links below, or just <a href="https://scottsauber.com/2017/04/10/how-to-troubleshoot-an-error-occurred-while-starting-the-application-in-asp-net-core-on-iis/" rel="noopener noreferrer" target=_blank>troubleshoot your app</a>.</p> <ul><li><a href="https://docs.microsoft.com/el-gr/aspnet/core/host-and-deploy/azure-iis-errors-reference?view=aspnetcore-2.1&WT.mc_id=DT-MVP-5004591" rel="noopener noreferrer" target=_blank>Microsoft Docs: Common errors reference for Azure App Service and IIS with ASP.NET Core</a></li> <li><a href="https://scottsauber.com/2017/04/10/how-to-troubleshoot-an-error-occurred-while-starting-the-application-in-asp-net-core-on-iis/" rel="noopener noreferrer" target=_blank>Scott Sauber Blog: How to troubleshoot: “An error occurred while starting the application” in ASP.NET Core on IIS</a></li> <li><a href=https://forums.asp.net/t/2117362.aspx?An+error+occurred+while+starting+the+application+NET+Core+X86+v4+1+1+0+Microsoft+AspNetCore+Hosting+version+1+1+1+Microsoft+Windows+6+2+9200 rel="noopener noreferrer" target=_blank>ASP.NET forums: An error occurred while starting the application. .NET Core X86 v4.1.1.0 | Microsoft.AspNetCore.Hosting version 1.1.1 | Microsoft Windows 6.2.9200RSSHappy to include any other links!</a></li> <li><a href="https://blindcoder.uk/asp-net-core-2-an-error-occurred-while-starting-the-application/" target=_blank rel="noopener noreferrer">Blind Coder Blog: asp.net core 2: an error occurred while starting the application</a></li></ul> <blockquote> There is <strong>a newer version</strong> of this blog post!<br> Visit <a href="/an-error-occurred-while-starting-the-application-process-failure-and-many-more/">/an-error-occurred-while-starting-the-application-process-failure-and-many-more/ </a> </blockquote> </div> </div> <div class="row border-end border-start border-top bg-light mt-4"> <div class="col pt-2" style=text-align:center> This page is <strong>open source</strong>. 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