$ bitbake core-image-minimal
ERROR: ParseError at /var/lib/jenkins/workspace/thesis-build-yocto/meta-openembedded/meta-oe/recipes-core/packagegroups/packagegroup-basic.bb:12: Could not inherit file classes/bluetooth.bbclass
Looks like your meta-oe is from master but your oe-core is from a release branch? bluetooth.bbclass is only in oe-core master (and the shortly to be released 1.8 aka "Fido").