Trying to use the forecast value in chart properties but getting the error

I'm trying to get a forecast of quantity of sales for the current month using the last value projection in the chart properties. When I select the Forecast Value option, I get this error: 

An issue has occurred during processing. We are unable to complete the request at this time. 
Why am I getting this and how do I get around this? It only occurs when I select the Forecast Value, any other option works fine.



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