topic Qlik sense - migration failed in QlikView https://community.qlik.com/t5/QlikView/Qlik-sense-migration-failed/m-p/120340#M1248441 <HTML><HEAD></HEAD><BODY><P>Hi! I haver migrate Qlik sense Server from 3.2 to Febrero 2018.</P><P></P><P>its all ok but, all days, there is an error in apps: "App migration failed".</P><P></P><P>In the txt log, there is a description about the error (or WARN):</P><P></P><P><STRONG>Migration failed: Failed to connect a web socket against Engine: &lt;no additional data&gt;</STRONG></P><P></P><P>If i export the app and import again, the error dissapear, but when I copy an app, the copy have the error.</P><P></P><P>Any ideas?</P><P></P><P></P><P>Thank you very much!</P></BODY></HTML> Mon, 26 Jan 2026 18:19:17 GMT juan_patrick 2026-01-26T18:19:17Z Qlik sense - migration failed https://community.qlik.com/t5/QlikView/Qlik-sense-migration-failed/m-p/120340#M1248441 <HTML><HEAD></HEAD><BODY><P>Hi! I haver migrate Qlik sense Server from 3.2 to Febrero 2018.</P><P></P><P>its all ok but, all days, there is an error in apps: "App migration failed".</P><P></P><P>In the txt log, there is a description about the error (or WARN):</P><P></P><P><STRONG>Migration failed: Failed to connect a web socket against Engine: &lt;no additional data&gt;</STRONG></P><P></P><P>If i export the app and import again, the error dissapear, but when I copy an app, the copy have the error.</P><P></P><P>Any ideas?</P><P></P><P></P><P>Thank you very much!</P></BODY></HTML> Mon, 26 Jan 2026 18:19:17 GMT https://community.qlik.com/t5/QlikView/Qlik-sense-migration-failed/m-p/120340#M1248441 juan_patrick 2026-01-26T18:19:17Z