https://community.esri.com/t5/water-resources-questions/error-when-using-longest-flow-path-tool-from/m-p/1083329#M4108 <P>You need to make sure the vector data is stored in a geodatabase. You cannot use shapefile.</P><P>Christine Dartiguenave</P><P>Esri Water Resources Team</P> Tue, 27 Jul 2021 22:27:58 GMT ChristineDartiguenave 2021-07-27T22:27:58Z https://community.esri.com/t5/water-resources-questions/error-when-using-longest-flow-path-tool-from/m-p/1078333#M4079 <P>Hi, I have downloaded and installed ArcHydro for ArcGIS Pro version 2.7.34, and am using ArcGIS Pro 2.7.2.</P><P>Whenever I try to use the Longest Flow Path tool, I get the following error message:</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="TDumas_0-1626193037107.png" style="width: 400px;"><img src="https://community.esri.com/t5/image/serverpage/image-id/18321i2A91F02E276D8108/image-size/medium?v=v2&amp;px=400" role="button" title="TDumas_0-1626193037107.png" alt="TDumas_0-1626193037107.png" /></span></P><P>&nbsp;</P><P>Here is a translation of the error message:</P><P>AddingField:, ('line 1808', 'C:\\Program Files\\ArcGIS\\Pro\\Resources\\ArcToolBox\\Scripts\\archydro\\apwrutils.py', 'OSError: "C:\\Projects\\Projects_north\\22984\\Data\\LongestFP" does not exist')<BR />Processing longest flow path on 1 feature from Area10m</P><P>('line 119', 'C:\\Program Files\\ArcGIS\\Pro\\Resources\\ArcToolBox\\Scripts\\archydro\\apnextid.py', 'AttributeError: Object\xa0: error in parsing arguments for the Describe command')</P><P>, (line 224', 'c:\\program files\\arcgis\\pro\\Resources\\ArcToolbox\\Scripts\\ArcHydro\\longestflowpath.py', "RuntimeError: cannot open 'C:\\Projects\\Projects_north\\22984\\Data\\LongestFP' ")</P><P>Failed to execute (longestflowpath).</P><P>&nbsp;</P><P>All of the layers used as parameters are located in my C drive. The path to my data doesn't contain any spaces.</P><P>The other tools from Arc Hydro that I used (Flow Direction and Flow Accumulation) worked fine, I seem to only have a problem with the Longest Flow Path tool.</P><P>Has anyone experienced a similar problem? Is there anything that can be done to get the Longest Flow Path tool to work?</P><P><BR />Thanks in advance!</P> Tue, 13 Jul 2021 16:25:49 GMT https://community.esri.com/t5/water-resources-questions/error-when-using-longest-flow-path-tool-from/m-p/1078333#M4079 TDumas 2021-07-13T16:25:49Z https://community.esri.com/t5/water-resources-questions/error-when-using-longest-flow-path-tool-from/m-p/1083329#M4108 <P>You need to make sure the vector data is stored in a geodatabase. You cannot use shapefile.</P><P>Christine Dartiguenave</P><P>Esri Water Resources Team</P> Tue, 27 Jul 2021 22:27:58 GMT https://community.esri.com/t5/water-resources-questions/error-when-using-longest-flow-path-tool-from/m-p/1083329#M4108 ChristineDartiguenave 2021-07-27T22:27:58Z