Because every version of flutter_test from sdk depends on collection 1.19.0 and XXX depends on collection 1.18.0, flutter_test from sdk is forbidden.
So, because XXX depends on flutter_test from sdk, version solving failed.
Collection 1.18.0 update
Troubleshooting
I have to manually update the version to 1.19.0 to correct this issue. Instead of flutterflow exporting the code with version 1.19.0 by default.
No
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