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This error says something has not tidied up after itself after doing doing drawing on the screen. This something will be one of your mods, but the error message does not say which one. This search on github, shows the issues where this has been reported before: https://github.com/search?q=java.lang.IllegalStateException%3A+Pose+stack+not+empty&type=issues Some of these are quite old, but one of the more recent ones may match one of your mods? Otherwise the only way to find the problem mod is to remove mods one-by-one until the problem stops happening. You should do this on a copy of your world or make a backup of your world in case this testing causes problems. Or you can test each mod individually in a different installation to see if it gives you this error. The most likely candidates are the ones mentioned in your stacktrace, but it could be any mod.

Problem with Optifine. Refer to the Optifine downloads page regarding compatibility with Forge.