Hello,
If you imported the Simulink project into the S32DS, please make sure you don't have the S32K1xx toolbox installed in a path that contains spaces. If so, reinstall the S32K1xx toolbox in a short path that do not have any white spaces.
Secondly, if you want to debug the application, you can do that without importing the project into the S32DS> Open a S32K1xx example project from the SDK (you need to install the S32K1xx SDK into the S32DS). Make sure the example project uses the same board as you.
Then, expand the debug button and click on Debug Configurations:

Then select a debug configuration (depending also on the debug probe you have). In the MAIN tab, you have an edit box where you can select the path to an elf file. Select the ELF generated by the Simulink application, then click debug. The perspective should switch to the DEBUG perspective and you can debug the application from here.

Best regards,
Sorin Bancila