'Variable "assetSourceOptions" does not exist' after updating to Craft 2.6 When I try to add another field, suddenly I get this error:
"Variable "assetSourceOptions" does not exist"

This started after I updated to Craft 2.6
It looks like the Redactor I plugin was incompatible with Craft 2.6... Fortunately, Brandon fixed this last night!

Update your version of Redactor I, and the problem should be fixed.