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

  • Updated on Mar 27, 2025
  • Published on Mar 20, 2024
  • 1 minute(s) read
  • Alice Petruzzella
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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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