https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1090551#M6515 <P>I am attempting to append one hosted feature layer into another. Both are points. Receiving the following error<BR /><BR /></P><PRE><SPAN class="ansi-red-intense-fg ansi-bold">Exception</SPAN>: Object reference not set to an instance of an object. (Error Code: 400)</PRE><P>Code snippet below.&nbsp;<BR /><BR />target_item = gis.content.get('***')<BR />t_flayer = target_item.layers[0]<BR /><BR />append_item = gis.content.get('***')<BR />a_flayer = append_item.layers[0]</P><P>feat_collection = arcgis.features.FeatureCollection.fromitem(append_item)</P><P>t_flayer.append(feat_collection, upload_format='featureCollection', field_mappings=[])</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 19 Aug 2021 19:20:28 GMT wparra_ripco 2021-08-19T19:20:28Z https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1090551#M6515 <P>I am attempting to append one hosted feature layer into another. Both are points. Receiving the following error<BR /><BR /></P><PRE><SPAN class="ansi-red-intense-fg ansi-bold">Exception</SPAN>: Object reference not set to an instance of an object. (Error Code: 400)</PRE><P>Code snippet below.&nbsp;<BR /><BR />target_item = gis.content.get('***')<BR />t_flayer = target_item.layers[0]<BR /><BR />append_item = gis.content.get('***')<BR />a_flayer = append_item.layers[0]</P><P>feat_collection = arcgis.features.FeatureCollection.fromitem(append_item)</P><P>t_flayer.append(feat_collection, upload_format='featureCollection', field_mappings=[])</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P> Thu, 19 Aug 2021 19:20:28 GMT https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1090551#M6515 wparra_ripco 2021-08-19T19:20:28Z https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1091580#M6526 <P>Obvious question, but do both feature layers schema match?</P> Tue, 24 Aug 2021 04:42:31 GMT https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1091580#M6526 PeterMilenkovic 2021-08-24T04:42:31Z https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1106071#M6723 <P>yes</P> Fri, 08 Oct 2021 19:12:09 GMT https://community.esri.com/t5/arcgis-api-for-python-questions/append-error/m-p/1106071#M6723 wparra_ripco 2021-10-08T19:12:09Z