Test Class Error - CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY

I am getting this error message and can’t seem to figure out what is causing it. I have a test class where I am creating a new Task record. In my sandbox the test class passes fine, but in production during deployment I get this error:

"System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, TaskAction: data changed by trigger for field Task Record Type ID: value not valid for the entity: Task: []
"

 Task newTask = new Task();
 newTask.Subject = 'Test Task';
 newTask.WhatId = opp.Id;
 newTask.WhoId = con.Id;
 newTask.Status = 'Open';
 newTask.Priority = 'High';
 newTask.Type = 'Call';

 insert newTask;

The variables opp.Id and con.Id are the IDs after inserting dummy contact and opportunity records that part of the dummy data set used in my test class.