FastReport Designer - Getting Metadata file 'Microsoft.CSharp' could not be found from Expression

Getting the error "Error CS0006: Metadata file 'Microsoft.CSharp' could not be found" when setting any basic expression for a parameter in the FastReports Designer (.Net Trial version) then trying to user report.Prepare(); in an application.

Am I missing a plugin or just setting the expression wrong? I tested using the most basic [Sqrt(4)] as the expression and run into the failure. When it is blank, the error does not happen


  • Resolved this by downgrading the following packages to v2021.4.0:

    • FastReport.OpenSource
    • FastReport.OpenSource.Export.PdfSimple
    • FastReport.Data.MsSql

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