No named captures in 'expression' parameter error in multiline in_tail

[nicolashmln]

I try to create a multiline parse via the in_tail configuration and I got the No named captures in 'expression' parameter. The regexp must have at least one named capture error. From what I understand there is no expression parameter in multiline? Only format_firstline and formats?

I have the 1.2.1 version.
Am I doing something wrong?

[interceptor]

My feeling is that this project here is dead. Last update 2018?!