error evaluating function 'userdatetime' : The passed parameter(s) are of wrong type. JAXB was not able to produce a value for typed value TypedValue[it=3,v=46;]

We are seeing the below error specifically for 2 users:

Error evaluating function 'userdatetime' : The passed parameter(s) are of the wrong type. Received the type com.appiancorp.common.xml.JaxbConversionException: JAXB was not able to produce a value for typed value TypedValue[it=3,v=46;] as java class java.lang.Long.) (Data Outputs)

We tried to look for any abnormal date format (working format is 2017-04-07 10:25:00) but couldn't find any so far. However, when we filtered fewer data using rdrop(), the flow was going through successfully.