I was not able to reproduce this on 1.642.3, which is the minimum Jenkins version that the plugin supports and what all tests are run against in CI, which is why this was not discovered before release of 1.0.4. I was able to reproduce the behavior on 2.60.1.
The logs display the following (and only errors)
Sep 13, 2017 7:47:04 PM hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1 error
INFO: Failed to instantiate optional component se.diabol.jenkins.pipeline.trigger.BPPManualTriggerResolver; skipping
Sep 13, 2017 7:47:10 PM hudson.ExtensionFinder$GuiceFinder$FaultTolerantScope$1 error
INFO: Failed to instantiate optional component se.diabol.jenkins.pipeline.domain.status.promotion.PromotionStatusProvider; skipping
This issue probably occurred due to failure in the infrastructure. It seems like the 1.0.4 worked for some users. Will issue a new release of the plugin which hopefully will be packaged and distributed correctly as expected.