The Prompt Code: Is your Sitecore loading icon does not disappear on your Sitecore Experience Editor Screen and you are getting 500 error (Ribbon.aspx) in the Browser Developer console?

"The value of a man should be seen in what he gives and not in what he is able to receive"

― Albert Einstein ―

Is your Sitecore loading icon does not disappear on your Sitecore Experience Editor Screen and you are getting 500 error (Ribbon.aspx) in the Browser Developer console?

Ribbon.aspx: Failed to load resource: the server responded with a status of 500 ()

Is your Sitecore loading icon does not disappear on your Sitecore Experience Editor Screen and you are getting 500 error (Ribbon.aspx) in the Browser Developer console?

This issue is mostly likely related to your Sitecore group or user security permissoins on Devices item located "/sitecore/layout/Devices". You have to make sure that your user or sitecore group has Read only permissoins to Devices and all children items. Once you grant read only access then this error will go away.