We are not aware of this error and it is not thrown by the RadFileExplorer. Such error might occur if you are trying to access content of an IFrame that is from different domain. Could you please provide more detailed information on the specific scenario?
- Are you using the default content provider or you have implemented a custom one?
- Do you have assigned a handler to the ClientFileOpen client-side event?
- Could you please provide a sample fully runnable project reproducing the problem so we can examine and debug it locally?
Looking forward to hearing from you,
the Telerik team