Thank You for response…
It’s Tomcat 9.0.33, jdk11.0.6, generally I have webapps: flowable-admin etc. and additional 1 webapp (.war) based on springboot which handle steps in process.
Unfortunately it still generates the same error during option “changeState” on instance diagram.
BTW. I’ve noticed “strange behavior” when I change from step “intermediateCatchEvent” to another “intermediateCatchEvent” the diagram “paint” this target step on green and no errors in log (steps between are black), but when it’s other type of step then above errors appear.