Get Total Item/Row Count: javascript error

I am getting a javascript error while using the ATS action ‘Get Total Item/Row Count’. I dont understand why and how to fix this problem. Get Total Item/Row Count Caused by: com.mansystems.ATS.Runner.exceptions.RunnerException: javascript error: Cannot read property '3' of null JavaScript stack: TypeError: Cannot read property '3' of null The widget name that I include is gridBetrokkenAL, because the class of the datagrid is mx-grid mx-datagrid mx-name-gridBetrokkenAL.
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