This exception is thrown when some part of the Template of the controls cannot be accessed. A possible reason for this is wrong reference to our Windows 8.1 and/or Windows Phone 8.1 binaries. To overcome this issue please follow the steps described in the Start Using Telerik UI for Windows Universal article. This is the recommended approach.
If, however, it is not possible for you to use the SDKs you can use direct references to the corresponding binaries. This means that you need to refer the Windows Phone 8.1 binaries in the Windows Phone 8.1 project.
Also, it is important to keep in mind that the folder structure inside the Binaries
folder should not be changed. In other words, if you need to move the binaries somewhere else, not in the default installation path, you should move the Binaries
folder as one. It is not recommended to reorder the dlls inside it.
In case that you reference the binaries manually, you can find which binaries are required for each control in the control's GettingStarted
I hope this information is helpful.
Pavel R. Pavlov
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