Not able to load or prepare loki recording rule with Cortex 0.10.7

[frankbaumfalk]

When trying to prepare and load a loki recording rule with

 "cortextool rules load --backend=loki <file>"

I get the error :
"cortextool: error: 1:52: parse error: unexpected character: '|', try --help".
(This is usually the error when a pipe sign is used in the expression and flag "--backend=loki" is not passed.)
A "cortextool rules prepare --backend=loki " does not work either.

But running check and lint the file with "cortextool rules check/lint --backend=loki " gives no error.
What do I miss ?
Thx in advance.