Maybe this helps:

 "Error when parsing process details or variables" at start process node 

This error typically comes from an error in configuring the input parameters when starting that process. Can you share that?

Process Model Name: Constant 

Process Parameter = { docInfo: pv!docInfo[tp!instanceindex] }

Process Model Name: Constant 

Process Parameter = { docInfo: pv!docInfo[tp!instanceindex] }

Did you read the other post? Any insights?

This seems to be OK on first sight. I cannot say much without more details.

 UnattendedJavaActivityRequest] ERROR com.appiancorp.process.engine.UnattendedJavaActivityRequest - An error occurred while executing activity: id=268575788, classname=com.appiancorp.process.runtime.activities.StartProcessSmartService2
com.appiancorp.suiteapi.process.exceptions.SmartServiceException: userMsg[error.processDetails.userMsg=Error when parsing process details or variables] alertMsg[error.processDetails.alertMsg=Error when parsing process details or variables]
	at com.appiancorp.suiteapi.process.exceptions.SmartServiceException$Builder.build(SmartServiceException.java:145)
	at com.appiancorp.process.runtime.utils.SmartServiceExceptionFactory.createException(SmartServiceExceptionFactory.java:14)
	at com.appiancorp.process.runtime.activities.StartProcessSmartService2.computeDetails(StartProcessSmartService2.java:222)
	at com.appiancorp.process.runtime.activities.StartProcessSmartService2.computeDetailsWithRetry(StartProcessSmartService2.java:169)

You are aware that this is the same error message, just from the log file ?!?!

Some questions coming to my mind:

- Is pv!docInfo a multiple?

- Does pv!docInfo type match the the PV of the called model?

- Does it work when you start the process without MNI?