Ignore my previous - recompiled and now works ok. Now got parse error

Hello

Now I am running:
esnacc.exe -C -d csta2.asn1
csta2.asn1(501) : parse error at symbol "GraphicString"

Parsing errors---cannot proceed

line 501 in the file is like this:
GraphicString ::= [UNIVERSAL 25] IMPLICIT OCTET STRING

Any ideas why this is a problem?

Angus