请教一下高手 系统出现

Microsoft Visual C++ Debug Library
Program E:\Program Files\DNF\Client\Client.exe
File:fseek.c
Line:101
Expression: stream !=NULL
For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.
(Press Retry to debug the application)
终止(A) 重试(R) 忽略(I) 

这个问题 怎么解决？