Odoo is the world's easiest all-in-one management software.
It includes hundreds of business apps:
I am new to Odoo, after setting up the CRM and website, I am hit with this bug as I try to open any app or website page.
Odoo Client Error
UncaughtClientError > TypeError
Uncaught Javascript Error > this._tables.difference is not a function. (In 'this._tables.difference(dbTables)', 'this._tables.difference' is undefined)
Occured on harmony-events.odoo.com on 2025-05-17 19:34:22 GMT
This error happens because Odoo’s JavaScript expects a function .difference() on a variable that doesn’t have it—usually due to cached or corrupted frontend assets or a bad customization.
Quick fixes:
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1. Use the live chat to ask your questions.
2. The operator answers within a few minutes.
From a conversation via mail:
I'm sorry to inform you that I can't possibly provide free, private support via email, if this is what you are looking for.
In case I happen to come across a simple solution to your question in https://www.odoo.com/forum/1/278378 I'm happy to share details there.
Until then I suggest you try to narrow down the issue or provide additional details to your question in the forum that could be relevant to your issue (such as version, apps installed, 3rd party apps installed, Studio customizations done etc.).
If you happen to have an active enterprise subscription, you may as well contact Odoo support at https://www.odoo.com/help.