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Qlik sense - migration failed

Hi! I haver migrate Qlik sense Server from 3.2 to Febrero 2018.

its all ok but, all days, there is an error in apps: "App migration failed".

In the txt log, there is a description about the error (or WARN):

Migration failed: Failed to connect a web socket against Engine: <no additional data>

If i export the app and import again, the error dissapear, but when I copy an app, the copy have the error.

Any ideas?

Thank you very much!

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