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      Error Message During Compiling: 'System.Web.MimeMappings is not a Class'
      • 27 Mar 2025
      • 1 Minute to read
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      Contents

      Error Message During Compiling: 'System.Web.MimeMappings is not a Class'

      • Updated on 27 Mar 2025
      • 1 Minute to read
      • Contributors
      • Print
      • PDF
      Article summary

      This article describes a solution for the following compilation error that can appear in AX 2012:

      Error

      System.Web.MimeMapping is not a class.

      Resolution

      Lasernet needs at least .net version 4.5 in order to use the Attachment and loading of AOS/Client printers functions.

      Install .net version 4.5 or later, and then compile again.

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