incorrect name for parameter filename cannot write to such a file

You defined in some parametee a file name that has incorrect "file syntax" (using invalid characters) or that php user cannot write to.
Look at "parameter file" (where configuration is stored) and "log file".
In default config they are stored in files directory where projeqtor is installed. A "chmod -R 777" on that directory will fix issue.

On configuration screen, you must define :
Log file name (2 lines before last) : it is where log files will be written, default value is "../files/logs/projeqtor_${date}.log"
Parameter file name : it is where parameter file will be stored, default value is "../files/config/parameters.php"

Advise is to move these fles out of web reach, to be sure hackers cannot access them.
But whatever the place, PHP user (linux user launching php) must be able to write to these files.
More globally, ProjeQtOr will sometimes need to write on "../files" directory (to record thumbs for images, to store graphics for reports, ...) to you should give write access for php user to hole "../files" folder and sub-folders.