Queues diagnose "button" (GUI) issuue after 3.15.2 update

Hi, after i failed to upgrade hplip in the auto mode (error: Unable to recieve key from keyserver), I was able to do it manually, though also failed with those keys, when was installng plug-in through GUI. It seems that after the installation both printers (lj1018 & photosmart) works fine, but queues diagnose "button" in GUI not working:
HP Linux Imaging and Printing System (ver. 3.15.2)
Self Diagnse Utility and Healing Utility ver. 1.0
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Checking for Configured Queues....
error: PPD /etc/cups/ppd/Laserjet.ppd file not found
warning: Laserjet is not HP Device.
warning: Fail to read ppd=/etc/cups/ppd/Laserjet.ppd file
warning: Insufficient permission to access file /etc/cups/ppd/Laserjet.ppd
warning: Could not complete Queue(s) configuration check
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Question - whether it can lead to malfunction or better to leave things as they are (ub.14.04),
best wishes

Well, somehow everything was decided by itself. Probably took some updates and now it's ok with the queues diagnoses (and everything else too). Thanks a lot!!!