Error on dependencies of Flutter

Hello everyone in loading mongo_dart: ^ 0.7.0 + 2 and sevr: ^ 0.7.0 + 2 on Flutter/Dart.
I have the following error, can someone please help me about to solve it:

flutter pub get

Running “flutter pub get” in app

Because no versions of dio match >4.0.0 <5.0.0 and dio 4.0.0 depends on http_parser ^4.0.0, dio ^4.0.0 requires http_parser ^4.0.0.

And because every version of sevr depends on body_parser ^1.1.1 which depends on http_parser ^3.1.1, dio ^4.0.0 is incompatible with sevr.

So, because catering depends on both dio ^4.0.0 and sevr ^1.0.4, version solving failed.

pub get failed (1; So, because catering depends on both dio ^4.0.0 and sevr ^1.0.4, version solving failed.)

exit code 1

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