Please note that Aspose.Cells for .NET API uses the System.Drawing for certain features. In case you haven’t added the reference of System.Drawing.dll in your project you may encounter the mentioned error. Please try this on your end. If the problem persists, please zip your complete project (including assemblies) and share it here for your further investigation.
“Could not load file or assembly ‘Aspose.Cells, Version=5.0.0.0, Culture=neutral, PublicKeyToken=716fcc553a201e56’ or one of its dependencies. The located assembly’s manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)”