Unknown column 'webcrs3_prop_activity_rel.act_id' in 'where clause'

SELECT * FROM webcrs3_properties INNER JOIN tea_prop_activity_rel ON tea_prop_activity_rel.prop_id=webcrs3_properties.prop_id WHERE webcrs3_properties.prop_status='active' AND webcrs3_properties.prop_bc_live='live' AND webcrs3_prop_activity_rel.act_id=8 AND webcrs3_prop_activity_rel.act_onsite=1 AND 1=1 ORDER BY prop_phy_city