The error is happening when the fuse-620064-extras.tgz is unzipped to the fuse-6.2.0.redhat-064 version.
This extras file contains org.switchyard.component.bpel.cfg file, that is empty.
Then once the switchyard-bpel feature is installed, this file is overwrited:
https://github.com/jboss-switchyard/release/blob/2.x/karaf/features/src/main/resources/features.xml#L133
I've tested 2 cases, with different results:
CASE 1: Remove the empty org.switchyard.component.bpel.cfg file and install the feature. IT WORKS! No error.
CASE 2: Install the feature. It overwrites the org.switchyard.component.bpel.cfg file, but the config file it is not loaded, it is like it is keeping the previous config information (empty).
In my opinion it is not required in the extra config to include a org.switchyard.component.bpel.cfg empty file. It would solve the problem.