It just says i have to add the log file to this issue post. so here it is
debug.log

:
i hope it will get fixed soon. i used the newest 1.16.5 version of oauth with minecraft forge 36.2.30

may duplicate #27
also i got the same exception in Forge 1.16.5

Yeah this is a duplicate. But what Java version are you using? It should be the first few lines of your log file. I need the number and publisher (usually oracle)

@Sintinium the Newest Version of Java 8 64bit for win7