Question 1:

Getting the error "No Approval Rule exists for this object. Please assign a user the Marketing Default Approver Rule". This is occurring when an Accrual Budget is being sent for approval.

Resolution:

When setting up the Approval Rule Details for Accruals ensure that the Minimum Amount is 0 - as this is an accrual. This had been set to 1.

As soon as you changed it to 0 and then opened the Budget name and sent for approval, the error message no longer appeared and the Default Marketing Approver received a notification and was able to approve the budget. 
 

Question 2:

Request Approval from APPROVER Error 

Failed Activity Request Approval from APPROVER 
Activity Type Notice 
Error Name WFENG_NOTIFICATION_PERFORMER 
Error Message 3120: Activity 'APEXP/301347' has no performer. 
Error Stack Wf_Engine_Util.Notification_Send(APEXP, 549406, 301347, APEXP:OIE_REQ_EXPENSE_REPORT_APPRVL) Wf_Engine_Util.Notification(APEXP, 549406, 301347, RUN) 

Resolution:

For the errors with 'no performer' for 'Request Approval from APPROVER' Activity we should not restart the process, first we need to update the attribute values and then we can restart the process.

Once we open the workflow notification click on 'Activities History' and below we will have "Update Attributes" Button click on that and we will have fields with 

Approver ID
Approver Name
Approver Display Name 

Update above fields with proper values and Click on Apply Button , it will prompt with message 
"Confirmation The workflow-level attribute values have been updated."

Now go to "Monitor Activities History" window and cilck the " Request Approval from APPROVER" Button and Re-start the workflow now the workfow will route to correct person and will be in Active state. 

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