Plank Folder open with Filemanager results in opening in ARK

Hello everyone.
I have the following problem:

Plank-Dock v. 0.11.89-1 right-click on a folder and open in File Manager does not open the file manager Caja v.1.24.0, but opens the folder in Archiver ARK.
Caja is properly installed as the default file managerand works fine otherwise.
I am looking all day for the solution to this problem, can you please help me?

Components:
Processor Intel(R) Core(TM) i7-3630QM CPU RAM: 16286MB
Operating system Ubuntu 20.04.1 LTS X64
Kernel Linux 5.4.0-26-generic (x86_64)
KDE Plasma 5.18.5
Plank v. 0.11.89-1
Caja v.1.24.0

Thanks a lot!