@shreya_awati It looks like your project is for another variant of Eclipse (SW4STM) so it needs to be converted to CubeIDE format. Try importing it as shown:
Have you tried to import ac6 System ... project from the SW4STM32 subdirectory? Was the import successful or any errors? Please attach .project files before and after import.
In Linux the dotted files are invisible ;) Do whatever is needed in the Linux browser (nautilus?) to make them visible. And please attach the converter.log.
The log indeed has some errors. Sorry, I'm now out of ideas. Converter from SW4STM32 probably is no longer well maintained. Try to restore the original project file tree and repeat conversion - in case that .project and .cproject have been damaged by previous attempts and modified in place. If this won't help, have to convert the project manually.