Execution of unstructured grid failure https://dlt-acc.firelay.cloud/c/message_boards/find_thread?p_l_id=4041874&threadId=4393414 2026-05-12T16:52:01Z 2026-05-12T16:52:01Z Tamara Wood https://dlt-acc.firelay.cloud/c/message_boards/find_message?p_l_id=4041874&messageId=4393413 2017-04-05T03:17:29Z 2017-04-05T03:15:52Z

I have created a FM grid for a section of a river with several tight bends, and flood plains connected to the main channel, as well as flood plains off the main channel and connected by small feeder channels. I created it in many pieces and then merged the various pieces together. I worked on the final, complete grid to get the orthogonality down to what I thought was quite good. The grid saves just fine (or appears to) from RGFGRID as a _net.nc file. I can import the resulting _net.nc file back into RGFGRID without problems. <br /><br />However, when I try to create a project in Delft3D FM and import the grid, I get the following error:<br />Object reference not set to an instance of an object.<br /><br />Followed by:<br />Execution of Unstructured Grid has failed.<br /><br />I can import the individual pieces of the grid OK, but once the grid is merged into the whole, I can&#39;t isolate the problem area by cutting off pieces of the grid one at a time. <br /><br />If I try to import the grid without creating a project first, just from the import menu on the home tab, then I get an unhandled exception and the program crashes.<br /><br />I&#39;m attaching a picture of the grid so you get the idea of what the system looks like.<br /><br />Help in debugging this grid is greatly appreciated.

Tamara Wood 2017-04-05T03:15:52Z