Debug (Fix Crash Server)

Hello i have a project , but i got a problem it crash from unknown reason. I want someone to help me fix , to debug it to see from source code from where it crash and to fix it to be stable server. My project is .dll file , this file is hooked in application .exe I will pay after crash is fixed , and dont have any more crash. Budget of project is from 20$-60$ Skype: diablo777771