Fixed it. There were 2 typos in the file AEmisss_fast_skin_mayaTemplate.mel The word 'Simple' had to be replaced with the word 'Skin'. This section in the text editable file // bump editorTemplate -beginLayout (uiRes("m_AEmisss_fast_skin_mayaTemplate.kBumpShad er")) -collapse 1; editorTemplate -callCustom "AEmisssSimpleMayaBumpNew" "AEmisssSimpleMayaBumpReplace" "normalCamera"; editorTemplate -endLayout; should read // bump editorTemplate -beginLayout (uiRes("m_AEmisss_fast_skin_mayaTemplate.kBumpShad er")) -collapse 1; editorTemplate -callCustom "AEmisssSkinMayaBumpNew" "AEmisssSkinMayaBumpReplace" "normalCamera"; editorTemplate -endLayout; Working fine now.