Start by adding a r in front of all paths, for example
arcpy.env.workspace = r"c:\Users\C\Desktop\GIS\Geodatabases"
(raw strings). Or some characters might be interpreted as a tab / newline / etc. and the path wont work.
When you do
a_RBVeg = arcpy.MakeFeatureLayer_management(RBveglocation, "VEGETATION")
a_RBVeg will be a result ...