help my game crashes randomly

[McDevin]

Ok so i took a screen shot and my game went all whack the next time i tried to open Blockland it say "Fatal-ISV:dev\blockland\truck\engine\dgl\bitmapPng.cc @08" and sometimes i get to get to a server and its fine but in a minute-Fatal-ISV:dev\blockland\truck\engine\dgl\bitmapPng.cc @08-appears agian and the game crashes plz help

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[McDevin]

Ok so i took a screen shot and my game went all whack the next time i tried to open Blockland it say "Fatal-ISV:dev\blockland\truck\engine\dgl\bitmapPng.cc @08" and sometimes i get to get to a server and its fine but in a minute-Fatal-ISV:dev\blockland\truck\engine\dgl\bitmapPng.cc @08-appears agian and the game crashes plz help

It also says^{Error reading png file:Idat: CRC error}