[help] Runtime Error - R6025 (pure virtual function call)

this is happening to alot of people in the game, and I am not sure (I DON'T know) how to fix it, anyone might help with this ? HispanoZ source

http://i.imgur.com/BfWMt9o.png

c++ - Where do "pure virtual function call" crashes come from? - Stack Overflow
What can cause a pure virtual function call in C++? - Stack Overflow
https://support.microsoft.com/en-us/kb/125749
"Pure Virtual Function Called": An Explanation

Quote:

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Originally Posted by GigaToni

c++ - Where do "pure virtual function call" crashes come from? - Stack Overflow
What can cause a pure virtual function call in C++? - Stack Overflow
https://support.microsoft.com/en-us/kb/125749
"Pure Virtual Function Called": An Explanation

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So I'm guessing I have to use another FrontEndWarZ.cpp? Because it happens only when joining a server.
Or just what function should I replace with original ISS?

You should make yourself familiar with the basics.

https://msdn.microsoft.com/en-us/library/bb384844.aspx

Then you can figure out how to debug until the crash occurs and see the exact line.