custom tag install issue in CFMX 7

[WorkRequest]

I have a custom tag that is resided at the same folder as other cfm files that
calling the custom tag. At times I know it works, but at times it give me the
following error message. Then I move this tag to the global directory, it still
give me this error.
Does anyone experience this in CFMX 7?

Error message:
The system has attempted to use an undefined value, which usually indicates a
programming error, either in your code or some system code.
Null Pointers are another name for undefined values.

[CF_DAWG]

I ran into this also. It seems that if you place a new custom tag in a
directory for custom tags or if you change that director, you will get this
error. I resolved it by restarting the ColdFusion service. Hope this helps!