Hi Jorge,
Thank you for using Syncfusion controls.
Please find the possibilities for occurring your reported error,
1. Ensure your App.config file have any Syncfusion assemblies with specified version. If so, please remove that version.
2. Ensure whether all SfForm dependency assemblies are referred properly in your application.
3. Ensure the all Syncfusion assemblies are referred from same version. Please check the below image,
4. Please check your application assemblies are referred with any hint path.
Please ensure the above cases and let us know.
Regards,
Susmitha S