Error upon opening maps

[pacerier]

why do i keep having this error when i open maps:

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This application has encountered a critical error:
Not enough storage is avilable to process this command.
Program: c:\program files\warcraft iii\worldedit.exe
Object: .?AV?$TSGrowableArray@UObjectChance@@@@
Press OK to terminate the application.
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[Xantan]

cause its protected and youre using the world editor...