oxygen authoring bridge can't resolve com.jacob.com.Dispatch

We are using xmetal 14 and SDL Tridion Docs plugin  version 14.0.4730.3. On startup oxgyen complains that it can't resolve com.jacob.com.Dispatch. But, the path is plugin.xml:

<runtime>
<library name="TrisoftPlugin.jar"/>
<library name="lib/commons-io-2.6.jar"/>
<library name="lib/jacob-1.18.jar"/>
<library name="lib/trisoftAuthoringBridge.jar"/>
</runtime>

jar tf jacob-1.18.jar | findstr Dispatch

com/jacob/activeX/ActiveXDispatchEvents.class
com/jacob/com/Dispatch.class
com/jacob/com/DispatchEvents.class
com/jacob/com/DispatchIdentifier.class
com/jacob/com/DispatchNullProgramId.class
com/jacob/com/DispatchProxy.class

I'm using windows. A dll is in the path too:

jacob-1.18-x64.dll

Do you know what the problem might be?