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I want to raise an error if something specific happens and also show it in the UI. how can I do it?

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You can raise any odoo exception which will show the error message in the popup.

Ex:

from odoo.exceptions import ValidationError

raise ValidationError("This is error message.")


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UserError exception should be used in all cases where some action should not be allowed, when it goes against logic.

        if not self.checkout_ids:
            raise exceptions.UserError('Select at least one Checkout to send messages to.')
        if not self.message_body:
            raise exceptions.UserError('Write a message body to send.')

To Know More About different types of exceptions refer :

https://www.cybrosys.com/blog/raising-exceptions-odoo-13

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