The Gateway migration utility (GMU) throws this error when trying with migrateOut switch:
Execution failed. Reason: javax/activation/DataSource
Release : 10.1
Component : GMU
Java version incompatibility caused this issue
The Gateway version 10.1 supports Java 11 and the newest GMU version 1.8 also supports Java 11. If you try to use an older GMU with the newer Gateway or a newer GMU with an older Gateway, you may get this error "Execution failed. Reason: javax/activation/DataSource"