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After updating (NuGet) from version to, all events "OkButtonClicked" report a mismatch in event signature. 

I tried cleaning the solution, deleted "obj" and "bin", uninstalled and reinstalled assemblies but I cannot compile my project.

I also checked the DLL with disassembly and the signature seems to be correct, but netvertheless it  doesn't compile.

Error is: "Position 77:30. Signature (parameter 1) of EventHandler "oBwApp.Pages.PaladinPharma.CreazioneOrdineStepModuloGiornatePaladinPharmaView.pckMesePreferenziale_OnOkButtonClicked" doesn't match the event type"

The event in code-behind is like:

 private void pckMesePreferenziale_OnOkButtonClicked(object sender, Syncfusion.SfPicker.XForms.SelectionChangedEventArgs e).....