I have fortigate 1000d firewalls and I want to moritor CPU and Memory. then I downloaded a Mib file on my firewall box 

and I got FORTINET-FORTIGATE-MIB file. It has size 235KB. then I used the opmanager browser to upload and I have got some error "MIB file upload failed"

then I go to drop down list at MIB Browser. I found the FORTINET-FORTIGATE.mib but I got the error "Error parsing MIB:FORTINET-FORTIGATE-MIB.mib.  

Exception while loading MIB:IMPORTS failed: Could not find the file : C:/ManageEngine/OpManager/bin/../mibs/HCNUM-TC

Please upload the above dependency MIB to load FORTINET-FORTIGATE-MIB.mib"

please help me.