Error in process model

Question

a!localVariables(
 local!pressedButton: "cancel",
 local!getdata: rule!test_getRequestByID(ri!id),
 {
 a!columnsLayout( 
 columns: a!columnLayout(
 contents: a!sectionLayout(
 contents: {
 a!richTextDisplayField(
 value: a!richTextItem(
 text: if(
 a!isNullOrEmpty(local!getdata.lastUpdatedBy),
 "Already a user is working on this request",
 rule!GBL_displayUserFirstLast(loggedInUser()) & " is working on this request"
 ),
 color: "SECONDARY",
 size: "LARGE",
 style: "STRONG"
 ),
 showWhen: not(ri!editable)
 )
 }
 )
 )
 ),
 a!sectionLayout(
 contents: 
 {

 a!boxLayout(
 label: "Audit Approval Form",
 labelSize: "MEDIUM_PLUS",
 contents: {
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!textField(
 label: "Comments",
 labelPosition: "JUSTIFIED",
 value: local!getdata.requestorComments,
 saveInto: local!getdata.requestorComments,
 refreshAfter: "UNFOCUS",
 readOnly: true,
 validations: {}
 ),
 a!dateField(
 label: "Start Date",
 labelPosition: "JUSTIFIED",
 value: local!getdata.startDate,
 saveInto: local!getdata.startDate,
 readOnly: true,
 validations: {}
 ),
 a!dateField(
 label: "End Date",
 labelPosition: "JUSTIFIED",
 value: local!getdata.endDate,
 saveInto: local!getdata.endDate,
 readOnly: true,
 validations: {}
 ),
 a!textField(
 label: "Email Addresses",
 labelPosition: "JUSTIFIED",
 value: local!getdata.emailAddresses,
 saveInto: local!getdata.emailAddresses,
 refreshAfter: "UNFOCUS",
 readOnly: true,
 validations: {}
 )
 }
 ),
 a!columnLayout(
 contents: {
 a!textField(
 label: "Requested By :",
 labelPosition: "JUSTIFIED",
 value: local!getdata.requestorName,
 saveInto: local!getdata.requestorName,
 refreshAfter: "UNFOCUS",
 readOnly: true,
 validations: {}
 ),
 a!textField(
 label: "Requested Email :",
 labelPosition: "JUSTIFIED",
 value: local!getdata.requestorEmail,
 saveInto: local!getdata.requestorEmail,
 refreshAfter: "UNFOCUS",
 readOnly: true,
 validations: {}
 ),
 a!dateTimeField(
 label: "Requested On",
 labelPosition: "JUSTIFIED",
 value: local!getdata.createdOn,
 saveInto: local!getdata.createdOn,
 readOnly: true,
 validations: {}
 )
 }
 )
 }
 )
 },
 style: "#efefef",
 shape: "ROUNDED",
 padding: "STANDARD",
 marginBelow: "STANDARD",
 showShadow: false 
 ),
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!buttonArrayLayout(
 buttons: {
 a!buttonWidget(
 label: "Cancel",
 saveInto: {
 a!save(ri!submit, false),
 a!save(ri!test_requests, local!getdata)
 },

 submit: true,
 style: "NORMAL"
 )
 },
 align: "START"
 )
 },
 width: "AUTO"
 ),
 a!columnLayout(
 contents: {
 a!buttonArrayLayout(
 buttons: {
 a!buttonWidget(
 label: "Approve",
 saveInto: {
 a!save(local!getdata.auditEmail, loggedInUser()),
 a!save(local!getdata.auditName,rule!GBL_displayUserFirstLast(loggedInUser()) ),
 a!save(local!getdata.requestStatus,cons!test_AUDIT_STATUS_TYPES[2]),
 a!save(local!getdata.lastUpdatedOn, now()),
 a!save( local!getdata.lastUpdatedBy, loggedInUser() ),
 a!save(ri!test_requests, local!getdata),
 a!save(ri!submit, true)
 },
 submit: true,
 style: "PRIMARY",
 showWhen: (ri!editable)

 ),
 a!buttonWidget(
 label: "REJECT",
 value: "reject",
 saveInto: { 
 a!save(local!pressedButton,"reject"),
 a!save(local!getdata.requestStatus,cons!test_AUDIT_STATUS_TYPES[3])

 },
 style: "DESTRUCTIVE",
 disabled: false,
 showWhen: (ri!editable),
 )
 },
 align: "END"
 )
 }
 )
 }
 )
 },
 showWhen: local!pressedButton= "cancel"
 ),
 a!sectionLayout(
 contents: {
 a!boxLayout(
 label: "Rejection Comments ",
 labelSize: "SMALL",
 contents: {
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!textField(
 label: "Comment",
 labelPosition: "JUSTIFIED",
 placeholder: "Please Provide Rejection Comments",
 value: ri!test_requests.rejectionComments,
 saveInto:ri!test_requests.rejectionComments,
 refreshAfter: "UNFOCUS",
 validations: {}

 )
 }
 )
 }
 )
 },
 style: "#efefef",
 shape: "ROUNDED",
 padding: "STANDARD",
 marginBelow: "STANDARD"
 ),
 a!columnsLayout(
 columns: {
 a!columnLayout(
 contents: {
 a!buttonArrayLayout(
 buttons: {
 a!buttonWidget(
 label: "Cancel",
 value: "cancel",
 saveInto: {
 a!save(ri!cancel, false),
 a!save(ri!test_requests, local!getdata),
 a!save( local!pressedButton,"cancel")
 },
 submit: false,
 style: "NORMAL"
 ),
 a!buttonWidget(
 label: "Submit", 
 saveInto: {
 a!save(local!getdata.rejectionComments,ri!test_requests.rejectionComments),
 a!save(local!getdata.auditEmail, loggedInUser() ),
 a!save(local!getdata.auditName,rule!GBL_displayUserFirstLast(loggedInUser())),
 a!save(local!getdata.requestStatus,cons!test_AUDIT_STATUS_TYPES[3]),
 a!save(local!getdata.lastUpdatedOn, now()),
 a!save( local!getdata.lastUpdatedBy, loggedInUser() ),
 a!save(local!getdata.completedOn,now()),
 a!save(ri!test_requests, local!getdata),
 a!save(ri!submit, true)

 },
 submit: true, 
 style: "DESTRUCTIVE"
 )
 },
 align: "END"
 )
 }
 )

 }
 )
 },
 showWhen:local!pressedButton="reject"
 )
 }
) 
 In this interface I have added code (from line 11 to 15 ) to check if one person is working/opened it then for other person who is trying to open it should say "person is already working on it " 
 can you please help me with this and I'm getting error in the process model