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When trying to open any model (lesson file, sample file, or existing project) with a .dxf background layer or when importing .dxf through Modelbuilder , the following errors appear: The specified module could not be found. (Exception from HRESULT: 0x8007007E) or : The program can't start because acdb19.dll is missing from your computer. Try reinstalling the program to fix this problem.
If you're using WaterCAD, WaterGEMS, or HAMMER upgrade to SELECTseries 5 (08.11.05.61) or greater, which includes a fix and if you are using SewerCAD, SewerGEMS, or CivilStorm you should upgrade to SELECTSeries4 (08.11.04.58) then install the latest patch set for that version, which has a fix for this issue. Below is a wiki link with directions on how to download the latest version of the software.
https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/8175.how-do-i-download-watergems-watercad-hammer-sewergems-sewercad-civilstorm-stormcad-pondpack-flowmaster-culvertmaster.aspx
Make sure that there is a RealDWG folder in the program installation folder. This is installed with the software. If this folder is missing, download and re-install the software again, but the second install the software by right clicking on the executable file and choosing the "Run as Administrator" option.
If RealDWG is not the issue, check if you have had a video card driver update recently. If so, try rolling that back, or upgrade to a newer card version. (We have seen this with at least one case with an HP driver for Intel HD 400.) One way to check if it is the video card driver is to boot your computer in safe mode. This will use a different, generic driver. If you are able to open the project in safe mode, this helps to confirm it is a video driver issue.
Error opening model with DXF background layer applied: A procedure imported by 'Haestad.RealDWG.Interop" could not be loaded