java.lang.NoClassDefFoundError

[jobayerjim9]

java.lang.NoClassDefFoundError: Failed resolution of: Lkotlin/text/Regex;
what is the cause for this error?

Code is below
mNearDiscovery = new NearDiscovery.Builder()
.setContext(this)
.setDiscoverableTimeoutMillis(60000)
.setDiscoveryTimeoutMillis(60000)
.setDiscoverablePingIntervalMillis(1000)
.setDiscoveryListener(getNearDiscoveryListener(), Looper.getMainLooper())

            .build();
    mNearDiscovery.makeDiscoverable("Abcd","");

[Fgdou]

Add this dependency to you gradle file :

implementation 'io.reactivex.rxjava2:rxjava:2.1.8'

This worked for me