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TTworkbench: Why do I get 'NULL not declared ;' error while I import ASN modules?

 TTworkbench 32/64 Bit, Microsoft Windows/Linux
You have not imported the helper module ANSAUX containing this type (and other ASN types).

You can either add to your module the following import statement:
import from ASNAUX all;
or configure the TTplugin preferences in TTworkbench to always import implicitly the ASNAUX module:
Window > Preferences > TTCN-3 > TTplugins > ASN.1 > enable the checkbox "Implicitly import built-in module ASNAUX"

Product : TTplugins,Tool Handling