[1.7.10] i cant open GUI

Hi, I'm trying to make a custom crafting table with 4 slots in kind of a diamond shape. I have looked through several tutorials and so far I cannot find anything that works. the problem (as stated in the title) is that I can't seem to get the GUI to open.

Here's my main class(I've marked code related to my crafting table as "/*IMPORTANT!" to start related code, and "IMPORTANT!*/" to stop):

https://pastebin.com/z0fjjyrL

Here's my block class:

https://pastebin.com/bkzupBRM

My GUI class:

https://pastebin.com/DGtAz1mU

Container class:

https://pastebin.com/XQ2E0StV

And GUI Handler:

https://pastebin.com/EGGuUeYM

I am sorry if i wrote this post wrong in any way or if you need more data. I am very new to this and I just want things to work.