Fit trend from series extension 7.4 seems to be broken.
I am getting a "Missing predicted label" error. I have seen posts about this in the forum where other people have run into problems. To double check, I started up a VM with Rapidminer 7.1 with series extension 5.3 and the same process works without issues.
I know some of these extensions are "aging" but there are several useful operators in them.