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java.lang.NoSuchMethodError: sun.security.util.ManifestEntryVerifier.<init>(Ljava/util/jar/Manifest;)V You will need an older Java 8 build https://www.azul.com/downloads/?version=java-8-lts&os=windows&architecture=x86-64-bit&package=jre&show-old-builds=true Scroll down to 8u302b08 and install this build Then open your start.bat and use: "C:\Program Files\Zulu\zulu-8-jre\bin\javaw.exe" -Xmx4096M -jar forge-1.16.5-36.1.0.jar pause

The problem was my hordware. A ram-stick was causing the problem. After removing the ram-stick the issue was solved completely. thx for the help anyway

It seems like that worked so far! Thanks