Try to remove the piece of code in bold:

EXECUTE dbo.IndexOptimize

@databases = 'USER_DATABASES', -databasename,

@FragmentationLow = NULL,

@FragmentationMedium = 'INDEX_REORGANIZE,INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',

@FragmentationHigh = 'INDEX_REBUILD_ONLINE,INDEX_REBUILD_OFFLINE',

@FragmentationLevel1 = 5,

@FragmentationLevel2 = 30,

@sortinTempdb = 'Y'