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Templates disappeared in the backend

Verfasst: 3. Jul 2019, 18:35
von PetterJhon
Hello everyone,,,
unfortunately I am confronted with a completely unexpected error.
Unfortunately, I can no longer see templates in the backend, or open them.
When I go to the "Templates" area in the backend, I see the list with the created templates. If I now want to open one of them by clicking on the icon, all content has disappeared from the window. If I want to create a new Tempate, ditto. No content to see anymore.
Befor the error popped up I reinstalled the add-on addon in the Addons section, because I could not get the fast navigation up and running.
If I want to install another addon, I get the error:
PHP function exec () is
Can someone give me a hint how I can correct that?
Stand there unfortunately completely on the hose

In the front end, all issues are normal.
Redaxo: 4.5.1
Php: 5.3.27