Error message when joining servers.

When I join a server it literally kick's me out instantly without even loading world and it displays the following message:

( " Internal Exception: io.netty.handler.codec.DecoderException: com.google.gson.JsonSyntaxException: com.google.gsonMalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 2 " )

Not sure how to fix this issue/bug and I have googled how to, still no luck.