并发量较大时，出现如下错误，请问各位大神知道啥原因吗？

[LYH-8112]

Traceback (most recent call last):
File "/code/server.py", line 192, in server
ret = {"err": None, "data": getattr(JudgeServer, path)(**data)}
File "/code/server.py", line 99, in judge
output_dir=submission_dir)
File "/code/compiler.py", line 45, in compile
raise CompileError(error)
exception.CompileError