Post By Email Installation Backend White Page [solved], After Installation of Post by Email admin backend error Options

[herzenssache]

Hi everybody,

we do run a J2.5.4 site (migrated from J1.5 using JUpgrade).
Server Config is CentOs 5.8 with PHP 5.3.8
Community Builder 1.8
RS Firewall extenstion (backend access to PostbyMail is allowed).

We run several different extensions on our server that work perfectly fine on a Rockettheme template (Afterburner).

Installation of Post by Email Pro 1.3.5 without JoomSocial worked fine.
Accessing the admin backend menu calls "https://ourdomain.org/administrator/index.php?option=com_post_by_email"
This returns a white page.

Strangely enough after enabling debug info it now returns a white page too.
So I can not read out the debug info.

Any idea?
Just for info: Site is up and running for months working fine.
My guess is that it has something to do with the Migration from 1.5 to 2.5 using Jupgrade. This is what makes our site maybe different to "standard" installations.

Thank you for any help,
Matt

[Web Design Seo]

Open this link and make all step by step. If error is present, post here.

[herzenssache]

Open this link and make all step by step. If error is present, post here.

Thank you for your suggestion,

I found the error: I installed the wrong version
I did not purchase the Pro but standard version.
The standard version did not work under 2.5
The Pro backend works perfectly fine,

thank you,
Matthias

[Web Design Seo]

Ok, thanks.