Exception in thread "main" java.lang.UnsupportedOperationException

[incomprehended]

Describe the bug
When trying to obfuscate a jar (it is a Minecraft client jar, compiled with all dependencies) I get this error. The application works on another standalone jar file, but not this one.

To Reproduce
Steps to reproduce the behavior:

1. Try to obfuscate a jar file that might be a minecraft client or a big jar file.

Expected behavior
THe expected outcome was for the file to be obfuscated. However, it throws an error and then stops the obfuscation.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10 Pro | 20H2 (19042)
• Browser: Brave (??)
• Version: 1.0.8

Additional context
N/A