I am trying to invoke a subprocess by passing a CDT. Subprcess invocation is get

I am trying to invoke a subprocess by passing a CDT. Subprcess invocation is getting failed with following error.

There is a problem with task “xxxxx” in the process “yyy”. The following process parameters were of the incorrect type: zzz_CDT (type=1, Number (Integer))

I have cross checked many times. i am passing a null value ie empty value of the type that CDT but not an integer value.

Can you expalin what does it mean by "incorrect type: zzz_CDT (type=1, Number (Integer))"...

OriginalPostID-90940

OriginalPostID-90940

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