Cannot start QGIS dev - could not load qgis_app.dll

[chau]

I have a problem with my OSGeo4W64 installation, specifically QGIS 3.7 dev. When I start QGIS I get the following error:

Ooops, looks like an error loading QGIS.

Details:

Could not load qgis_app.dll
Windows Error: The specified module could not be found.

Help:

Check C:\OSGeo4W64\bin\qgis-dev-bin-g.env for correct environment paths.

I can see qgis_app.dll in the c:\OSGeo4W64\apps\qgis-dev\bin\ folder, but I don't have a qgis-dev-bin-g.env in the c:\OSGeo4W64\bin\ folder.

I have a qgis-dev-bin-g.exe and a qgis-dev-bin-g.vars .

I have just updated my OSGeo4W64 installation and it uninstalled QGIS 3.7 dev and installed a new version - and I still have the issue.

OS: Windows 10 x64.

[jef]

That might point to a problem with your GRASS install.

%OSGEO4W_ROOT%\etc\postinstall\qgis-dev.bat runs grass76 --config version to detect the version (currently 7.6.1), parses the major version number from it (7) and uses that in the name of the batch file and binaries (qgis-dev-bin-g7.bat and qgis-dev-bin-g7.exe). The batch file is then run with --postinstall to produce the .env - which apparently didn't happen on your machine.

What does grass76 --config version produce in your osgeo4w shell?

[chau]

I haven't installed GRASS (not on purpose at least and I haven't done anything to remove it if it was installed automatically).

grass76 --config version only produces 'grass76' is not recognized as an internal or external command, operable program or batch file. when I run it in the OSGeo shell.

If I run the setup and search for grass then none of the found items are installed.

[jef]

grass added as dependency. Reinstall qgis-dev please

[chau]

Thanks Jürgen, it works perfectly now!