I want to monitor some of my Lancom Routers (Lancom 1781VA and Lancom 1781A) with SNMP querys, the querys itself are working but I can’t get the import of the MIB files from the Routers working, everytime I try to import the MIB it tells me to import „HCNUM-TC“, after I downloaded some „HCNUM-TC“ MIB’s from the Internet and try to import the router file I get this error :

It happens at nearly every line, when I import the MIB into the MIB-Browser from IReasoning everything works fine, the IReasoning MIB-Browser imports HCNUM-TC, SNMPv2-SMI, SNMPv2-TC, RFC1213-MIB, when I import all those into the Host-Monitor it says all but HCNUM-TC are already imported, when I import them anyways nothing changes, I still get the Error from above.
Below is a download for the MIB's in the Zip is the MIB from one of the Routers (both get the same errors), and all of the MIB’s I imported, I hope someone had this problem before and could help me out

PS: If there is a way to attach the files directly to the post please tell me.
Files: http://ge.tt/55H7BQP2/v/0?c
Thanks in advance and greetings
Niklas