When Start Dynamo for Revit , It 'll be show in pic below .
How to Fix this error ?
Are you on latest Revit 2018.1 built? Check for updates at https://knowledge.autodesk.com/support/revit-products/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-tie-the-Build-number-with-the-Revit-update.html
Can you list down all the external addins/tools which you have in Revit 2018.
THX everyone , Today I’ll try to re-install again . It can be work normally.