Per another user, there may be an issue with TinkersConstruct and Buildcraft:

here is the crash report:
https://pastebin.com/embed_js/85shM94T

This (should) have been fixed by now -- can you update to 7.99.8?

Duplicate of #3534 Update!

I tried the 7.99.8 update without TC installed and crashed. ill make a new pastebin link.

Here is the new Crash Report.
https://pastebin.com/embed_js/8xk7YuLL

It looks like optifine is crashing on some models, although I guess that means that its buiildcraft related. Can you open a new issue about Optifine not being compatible with 7.99.8?

(Also can you try removing optifine temporarily to see if it makes any difference)

im going to remove it and test it now.

The game Runs with 7.99.8 as long as optifine is gone

Edit: that was with OptiFine_1.11.2_HD_U_B7.

Ok so I checked, and was using a much older optifine. worked fine with my setup until i added bc 7.99.8 but "OptiFine_1.11.2_HD_U_C3" works well with it.

So does it all work now? (If so please close this)

Im going to close this. Thanks Everyone.

And The good news is. With bc 7.99.8 and OptiFine_1.11.2_HD_U_C3........TConstruct-1.11.2-2.7.1.34 Works