when I click Play, the launcher closes but nothing opens. this doesn't happen with the previous version (1.0.12) but when I use 1.0.13 my game just won't launch

Crash report?

No crash report was generated. The javaw process runs as I see in task manager but it does not show

I experience the same issue. The game doesn't crash it runs as it is supposed to but the game window is not open and is only open in the background tasks section/ details section.

Then send the "latest.log"

Here you go
latest.log

I have done some test and the mods that crash are PlayerAPI and the new version. Player API is needed because some mods doesn't like some override optifine does to work. It's deprecated but is the recommend mod to solve the problem, and it works with the 1.0.12 of your mod.

sigh, I hate to deal with outdated mod.
I saw Player API replace the whole EntityPlayerSP class -.-

Please test with the experimental build, you can get it on my discord.

it works now with the experimental build, thanks!

Works great now! Good job.

sorry if this is an unrelated bug but when I try to see the bazaar price on the tooltips it says that the config is empty?

@Upgradingmaster You need an API Key for viewing bazaar data, my bad.