Cannot load Adtran Mibs

Cannot load Adtran Mibs

I get the following error after I import the MIB and try to select it:
 
Error parsing MIB:adAosCPU.mib
Exception while loading MIB:IMPORTS failed: Could not find the file : D:/PROGRA~1/MANAGE~1/OPMANA~1/./mibs/ADTRAN-AOS
 
MIB is attached

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