Hi Emylinmanuela,
Thanks for contacting Syncfusion support.
The reported error occurs when you have referred the assemblies from GAC location. While deploying or publishing the application, we should refer the assemblies from bin folder. So please refer the assemblies from bin folder instead of GAC location to avoid this kind of conflict.
Please let us know if you have any queries related to Syncfusion components.
Regards,
Dhivyalakshmi.