Hi Blanca,
Thank you for using Syncfusion products,
The reported issue will occur only when the application refers to the older version of assemblies even after upgrading to a higher version.
Please try the below given steps and let me know if this helps you
1) Open 11.4.0.26 Dashboard.
2) Run the AssemblyManger with 'RemoveAllversion' option. If you find any Syncfusion assemblies in GAC, Please remove all the Syncfusion assemblies manually.
4) Install the {required version} assemblies. For example, if your Target Framework is 2.0, then please remove 4.0 and 3.5 Syncfusion assemblies from GAC and Assemblies folder and vice versa.
6) Please check only required framework assemblies are in GAC (c:\windows\assembly) and also in Assemblies folder (C:\Program Files\Syncfusion\Essential Studio\11.4.0.26 \Assemblies\2.0)
7) Open the 11.4.0.26 dashboard.
8) Run the Multi Target Framework targeting to 2.0.
9) Click OK once operation completed successfully.
Please remove the older version dlls from your application which is found in ‘ReportLib’ project folder. This should cause the error on handling the form in designer mode. Also please ensure the older assembly does not get reflected anywhere in the project.
Please use the below steps for upgraded projects.
1) Remove Bin and Obj folder from Project path
2) Open the Visual studio IDE and open a project
3) Rebuild your project.
4) Please check once again the project refers the Syncfusion assemblies of version 11.4.0.26
Revert me if you need any clarifications.
Regards,
Vinothini R.