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We received an "evaluation only" warning in a new tab in Excel with our paid licence

We received this warning in a new tab in excel when generating a report
–> “Evaluation Only. Created with Aspose.Cells for .NET.Copyright 2003 - 2020 Aspose Pty Ltd.”
Our licence is paid and current.
We had to re-apply the licence file to resolve the issue
Does anyone know why this would occur??


Please note, according to our license mechanism, if you do not get license expiry message (exception) or any other exception but only get watermark in the output files/images, it means your licensing code is not processed at all, so you should debug your code by yourselves and make sure that your licensing code should be processed at first and before using any other Aspose.Cells APIs in your program and at least once in whole application life cycle. Moreover, you may also try restarting your server or application.