Fix login error message undefined

[vmittal05]

Hospital/Patient login error popup message is undefined: #129

Close #129

The login error msg was undefined as the "error.message" property doesn't exist on the Error object that was referenced in the code (Error.error.message).

Checklist:

• [X] I have mentioned the issue number in my Pull Request.
• [X] I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md

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