Hi @DRV1547 

The error message is just a hint to get you started on debugging your workflow code. Since I don’t know what your workflow code looks like, I can only provide general advice. 
Here are some ways to help you debug. Your best tool is the Log to History action. 

As always export and make a backup of your code first. When you are experimenting with your codes, there are times which you will completely mess up your codes. Import your backup.

First place to start is to check whether you are using any “Do Calculation” action which perform a mathematical calculation with two values and an operator. 
1. Replace any variables with hard-coded values eg “1” plus “1”. Able to publish?
2. Add “Log to History” action (before the Do Calc action) to displays the values of your variables. You expect your variable to hold a specific value eg “1” but it may hold another value “ONE”. What values are displayed? Do you know where the wrong assignment originated from?
3. Replace back with the correct variables with the correct assigned values. Able to publish?
 

Hi @DRV1547

Did you manage to resolve this error?

Built it in Workflow Cloud and did not have the same issue.