Hi Claudio
Thanks for using Syncfusion product.
Based on the information you provided, the issue is due to referring “Syncfusion.SfSchedule.WinRT.dll” (which is used for WinRT) assembly in your windows phone project. So instead you should use “Syncfusion.SfSchedule.WP.dll” in your windows phone project. Please find the respective dll location below.
Assembly Location: C:\Program Files (x86)\Syncfusion\Essential Studio\12.4.0.24\Assemblies for Windows Phone\8.1\ Syncfusion.SfSchedule.WP.dll
For your reference we have prepared a simple sample for SfSchedule control by only using “Syncfusion.SfSchedule.WP.dll” assembly. Please find the sample attachment.
Please let us know, if you have any concerns.
Regards,
Vigneshkumar R.