"No SELECT for file: CXML-ADD-CHILD" error

I have acuv8.1.1, I ever use it to successfully compile code which contain statement such as

"CXML-ADD-CHILD"/"CXML-MODIFY-CDATA". But today I want to compile it again, it keeps showing me "No SELECT for file: CXML-ADD-CHILD" compiling error.

It looks like acuv8.1.1 not supporting "CXML-ADD-CHILD".

Does anyone ever have similar experience?

FYI: both acu6.1.0 and acu8.1.1 are installed on my developing environment.

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