Resolved unable to install any other php version on Onyx 17.5

[khoubeib bach]

plesk -v
Product version: Plesk Onyx 17.5.3 Update #65
    Update date: 2019/02/28 11:12
     Build date: 2018/12/14 14:00
     OS version: Debian 7.11
       Revision: 55d1b49a272f44666e1920eca8b6e4da449a38cd
   Architecture: 64-bit
Wrapper version: 1.2

Hello,

I try to install another php version in addition to the one from OS vendor :

Primary components list / php_comps
===============================================================================

Select the components you want to install:
1. [ ] PHP 7.2
2. [ ] PHP 7.1
3. [ ] PHP 7.0
4. [ ] PHP 5.6
5. [ ] PHP 5.5
6. [ ] PHP 5.4
7. [ ] PHP 5.3
8. [ ] PHP 5.2
9. [=] PHP 5 from OS vendor

but i have this message :
---------------------------------------------------
Checking whether the package dependencies are resolved.
E: Unable to correct problems, you have held broken packages.
---X--- `apt-get` output ---------------------
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
plesk-php56-enchant : Depends: libenchant1c2a (>= 1.6) but it is not installable
plesk-php56-imagick : Depends: libmagickcore5 (>= 8:6.7.7.10) but it is not going to be installed
Depends: libmagickwand5 (>= 8:6.7.7.10) but it is not going to be installed
plesk-php56-pspell : Depends: libaspell15 (>= 0.60.7~20110707) but it is not installable

---------------------- `apt-get` output ---X---
Collecting error details into the log file...

ERROR: Installation will not continue
---------------------------------------------------

Any idea ??