Multiple mods using the same package name, at least one of them is signed. Java is expecting the rest of the JARs containing that package to have the same signer and they don't.

See Haxorouse for more details.

Log and Crash
latest (1).log
crash-2024-04-03_18.59.53-client.txt

Update Optifine to PreG6, G5 Optifine has a bug