Hi all.
Konqueror doesn't mount drives, it gives me this error:

Unable to mount this device.
Potential reasons include:
Improper device and/or user privilege level
Corrupt data on storage device
Technical details:
org.freedesktop.UDisks2.Error.NotAuthorizedCanObtain: Not authorized to 
perform operation

What am I doing wrong?
What should I show to understand what kind of error this is?