I have been running a function in Mathematica 10 with the command, DeleteDuplicatesBy. The function was working great until one day I started to get an error with the DeleteDuplicatesBy command. When I tried to run it, the command would turn red and say, "A symbol occurs in more than one context: One of the definitions is shadowed."
• Which contexts does the symbol appear in? (Determine this with Names["*DeleteDuplicatesBy"].) – Patrick Stevens Aug 17 '15 at 18:25
• Please try evaluating RebuildPacletData[] and see if this fixed the issue. – Stefan R Aug 17 '15 at 21:47
• What version of Mathematica are you using ({$VersionNumber,$ReleaseNumber}`)? Try turning off the suggestions bar in Preferences, restart Mathematica, and try again. I'm wondering if it is related to this – Szabolcs Aug 18 '15 at 6:00