[TYPO3-english] Core: Error handler (BE): PHP Warning: rtrim() expects parameter 1

[Peder Høy Kristensen]

I experience a strange error. When I try to save an ordinary text element in a certain folder, I get an error saying: "You are not allowed to access the given folder"
The log says:
"Core: Error handler (BE): PHP Warning: rtrim() expects parameter 1 to be string, object given in /usr/home/dan11720/public_html/typo3/sysext/recordlist/Classes/Browser/ElementBrowser.php line 1893"

Could someone please tell me, what I could do to make it work again?

Venlig hilsen / Best Regards
Peder Høy Kristensen