Please i need help with this "version solving failed."

I wrote a code that fetch FCM code from firebase so i use 'Firebase_Messaging' dependency. screenshot below BUT i kept getting these error when compiling.

"Error: Failed running flutter pub get...

Because http >=1.1.2 <1.2.1 depends on web >=0.3.0 <0.5.0 and custom_widget depends on web ^0.5.1, http >=1.1.2 <1.2.1 is forbidden.

So, because custom_widget depends on http 1.2.0, version solving failed."