View source for Template:FAQ:MIBs 10

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Any MIB file starts with an (optional) list of identifiers that
it "imports" from other files.  The parser handles this using
a fixed size buffer to hold the import information.
There are two circumstances in which this can result in the
error message shown above.

Firstly, if the MIB file refers to an unusually large number
of external identifiers.  Handling this case requires a (trivial)
patch to the parsing code.  Contact the coders list for advice.
(This is extremely rare - the only example that
we've come across is the Cabletron Trap MIB).

Much more common is a syntax error in the IMPORTS clause of the
MIB file in question.  In particular, check that this section ends
in a semicolon, before going on to the main MIB object definitions.