hi experts,

After I upgrade jenkins from ver. 2.222.3 to 2.235.1 and the blue ocean related plugins from 1.23.2 to 1.23.2, the below error message pop up when i opened blue ocean, then edited:

"There was an error loading the pipeline from the Jenkinsfile in this repository. Correct the error by editing the Jenkinsfile using the declarative syntax then commit it back to the repository."

In fact, the Jenkinsfile is really declarative syntax. They worked well before upgrade. And now only the edit function failed.  I tried to downgrade to old version, no help. One more thing, I am not sure if i am trying to edit them during upgrade. 

Could  you please give some hints here? Thanks.