I'm trying to migrate from 3.x.x to 4.x.x and facing an error. I've created a mpk of my project and tried to import this mpk into mendix 4. Normally mendix asks to convert the project into a new version, but this time I get this error: The project located at G:\projecten\portal\NewProject\portal.mpr could not be opened, because it was created with version 3.3.2 of the Modeler, which is incompatible with this version of the Modeler. How can I convert my project?
3.3.2 is a more recently released modeler version than 4.0.1, you can't convert from 3 to 4 just because the major version is higher. The easiest way is to wait for 4.1 and then convert to that.
Or you could manually edit the modeler database but if you are actually using features that were added to the model in 3.3.2 (and are thus not in 4.0.1) you could corrupt your project.