Error while invoking process inside interface in SaveInto of "SubmitLink"proce

Using the below code to trigger a process upon clicking on an iconindicator image. Used SubmitLink to show confirm message and upon confirming, the process model is triggered, but still throws the error in the image below. Please advise if anything wrongly save into target variable inside the SubmitLink which is where the error is pointing to.

Code: 

a!imageField(
label: "Take Action",
showWhen: ri!enableTriggerImages,
images: {
a!documentImage(
document: a!iconIndicator(
"MOVE_RIGHT"
),
showWhen: isnull(rule!NSA_GetStatusOfApprovalTeam_ExprRule(ri!NSARequest, fv!item)),
altText: "Submit",
caption: "Submit " & fv!item,
link:
a!submitLink(
label: "Submit for Review",
confirmHeader: "Please confirm!",
confirmMessage: "Please confirm to submit.",
confirmButtonLabel: "Confirm",
confirmButtonStyle: "PRIMARY",
/*value: ri!NSARequest,*/
saveInto: {
a!startProcess(
processModel: rule!NSA_GetPMConsByTeam_ExprRule(fv!item),
processParameters: {
NSARequest: ri!NSARequest,
cancel: false,
newComments: null,
taskRequest: true,
teamToAssignTask: rule!NSA_GetGroupByTeamName_ExprRule(fv!item),
updateRequest: false
},
onSuccess: a!save(
ri!NSARequest,
null
),
onError: a!save(
ri!NSARequest,
null
)
)
}
)
),

a!documentImage(
document: a!iconIndicator(
"MOVE_RIGHT_DISABLED"
),
showWhen: not(isnull(rule!NSA_GetStatusOfApprovalTeam_ExprRule(ri!NSARequest, fv!item))),
altText: "Action Completed.",
caption: "Action Completed."
)
},
size: "ICON"
)

Error: