I am using nintex in an office 365 environment. I am working with a state machine. At first I thought the workflow was erroring because I had added a "run if" command and a conditional branch command within a state of a state machine. After removing the things I had thought were the cause I am still recieving the error. All it should be doing is waiting for tasks to complete and then send emails. It goes into a suspended status as soon as it tries to send an email. The error code I am getting is:
RequestorId: 8c3b2a5b-c388-f407-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.InvalidCastException: String at Microsoft.Activities.GetDynamicValueProperty`1.CheckedRead(String propertyName, DynamicItem value) at Microsoft.Activities.GetDynamicValueProperty`1.Execute(CodeActivityContext context) at System.Activities.CodeActivity`1.InternalExecute(ActivityInstance instance, ActivityExecutor executor, BookmarkManager bookmarkManager) at System.Activities.Runtime.ActivityExecutor.ExecuteActivityWorkItem.ExecuteBody(ActivityExecutor executor, BookmarkManager bookmarkManager, Location resultLocation) Exception from activity GetDynamicValueProperty<String> FormatString NintexActivities.WorkflowXaml_8e03d64c_49b1_4845_a435_94f748f07d04 Sequence If If While State Machine Sequence Flowchart Change Workflow.WorkflowXaml_f1ecdccd_fb76_4183_a267_def11edbc6b1
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It is definitely failing inside the Send Email action, however I cannot see exactly why from this stack. Are you using Internal Email (O365) or External Email (Nintex) in the action configuration?
Somewhat related, there is a feature request here regarding error messages that you may want to comment or vote on if you have not already: Workflow Errors – Customer Feedback for Nintex. The error you are seeing here is from the Workflow Engine and these are not always very useful in unexpected situations such as yours.