Need Help loading comtech CDM570L MIB

Need Help loading comtech CDM570L MIB

Hello, i have been trying to load a comtech CDM570L MIB in the OPmanager using the MIB Browser, 
but i keep getting error messages saying 
Error parsing MIB:fw10874-3e-new.mib
Exception while loading MIB:IMPORTS failed: Could not find the file : C:/MANAGE~1/OPMANA~1/./mibs/ComtechEFData

however when i use another MIB browser, it works fine. 

please help me.
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