Problems after Upgrading to 12.0.18 /etc/apt/sources.list

[xsaver]

Where have my entries gone ?

## This is temporary appended by Autoinstaller for 
## specify source of product's packages for APT.
deb https://autoinstall.plesk.com/debian/PSA_12.0.18 wheezy all
deb https://autoinstall.plesk.com/debian/SITEBUILDER_12.0.5 all all
deb https://autoinstall.plesk.com/debian/BILLING_12.0.18 all all

This is all what is left.

My OS is Debian 7.5 and I had no problems with 11.5.30 but after upgrading I can't access servertools -> updates and upgrades.
Running /usr/local/psa/admin/bin/autoinstaller gives me

not a reference at /usr/bin/apt-show-versions line 266
E: Problem executing scripts APT::Update::Post-Invoke-Success 'test -x /usr/bin/apt-show-versions || exit 0 ; apt-show-versions -i'
E: Sub-process returned an error code
Warning: there are errors in 'apt-get update'

ERROR: Not found source for system packages (release 7.5) in APT software sources configuration:
Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 https://autoinstall.plesk.com/debian/BILLING_12.0.18/ all/all i386 Packages
     origin autoinstall.plesk.com
 500 https://autoinstall.plesk.com/debian/BILLING_12.0.18/ all/all amd64 Packages
     origin autoinstall.plesk.com
 500 https://autoinstall.plesk.com/debian/SITEBUILDER_12.0.5/ all/all i386 Packages
     origin autoinstall.plesk.com
 500 https://autoinstall.plesk.com/debian/SITEBUILDER_12.0.5/ all/all amd64 Packages
     origin autoinstall.plesk.com
 500 https://autoinstall.plesk.com/debian/PSA_12.0.18/ wheezy/all i386 Packages
     origin autoinstall.plesk.com
 500 https://autoinstall.plesk.com/debian/PSA_12.0.18/ wheezy/all amd64 Packages
     origin autoinstall.plesk.com
Pinned packages:

Need help !