Unity crash with "Crash! SymInit....." and "mono_string_hash + 0x13"

when I call a method frequently like

Class.TryCall(“StringArugment”);
Unity crash!! The editor log show’s:

Crash!!! SymInit: Symbol-SearchPath: xxxxxx…

58392-62259308-ee62-4e7f-b1c2-a0a1b3777305.png

with the last stack trace “mono_string_hash + 0x13” enter image description here

[58393-qq截图20151119140656.png|58393]
I’m using Unity 4.6.4.

Every crash will be made by a different C# method, and it’s not stable.

i come across like this too.
4.7.2f1