Traceback (most recent call last):
  File "C:\Users\karenkburke\Documents\ArcGIS\Climate\Climate30_loop1_mcg_modified.py", line 97, in <module>
    arcpy.AddJoin_management("Layer1", "SiteID", "C:/Users/karenkburke/MyDocuments/ArcGIS/Climate/Input/Test_Sheds.dbf", "SiteID")
  File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\management.py", line 5632, in AddJoin
    raise e
arcgisscripting.ExecuteError: Failed to execute. Parameters are not valid.
WARNING 000970: The join field SiteID in the join table Sites_no3414 is not indexed. To improve performance, we recommend that an index be created for the join field in the join table.
ERROR 000732: Join Table: Dataset C:/Users/karenkburke/MyDocuments/ArcGIS/Climate/Input/Test_Sheds.dbf does not exist or is not supported
Failed to execute (AddJoin).