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Error 302 or 305 when analysing water network with Devotech iDAS in Civil 3D

In some cases you may experience Error 302 or Error 305 when running a water network analysis with Devotech iDAS in Autodesk® Civil 3D®:


Try the following suggestions to solve this error:


Problem 1: A drawing might reside in a directory to which the user does not have the right permission.

Solution: Move the drawing to your desktop, open it from this new location and rerun the analysis.


Problem 2: Multiple Civil 3D instances are causing the issue.

Solution: Close all running Civil 3D instances for all the Civil 3D versions and start-up only one Civil 3D instance.


Problem 3: Civil 3D limits access to the location where the drawing is saved.

Solution: Set the folder where the drawing is saved as a trusted location. Open Civil 3D Options:


Select the Trusted Location folder, click on Add and browse to the folder where the drawing is saved. If you want to include the selected folder as well as its subfolders, you must add three dots “…” at the end of the folder path:


Problem 4: The drawing path or drawing name is too long.

Solution: Move the drawing to a folder with a shorter path or rename the drawing.


Problem 5: Civil 3D does not have permission to create a file in the location where the drawing is saved.

Solution: Run Civil 3D as administrator (right-click on the Civil 3D icon and use the Run as administrator command)


Problem 6: The user’s antivirus is blocking the temporary file which is created by Devotech iDAS in the location where the drawing is saved when running the analysis.

Solution: Create an exception rule on the firewall to allow access to EPA SWMM and SSA.


Problem 7: The user is using Bentley Project Wise and it does not allow the user to create that file type on the system.

Solution: Move the drawing to the C drive and then run the analysis.

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