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Closes #151
Aside from creating the required modal. I also make the error handling more specific for each type of error. There are 3 different errors (no wallet installed, no wallet unlocked, and wallet account rejected -this is metamask specific-)
You can see the behavior for each type of error here (I'll let a transcription of the text displayed in each scenario; for any change required):
no wallet installed
message:
no wallet unlocked
message:
wallet account rejected
message: