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Gousigan Sivapalan

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

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Christoph Farnleitner

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.

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D Enterprise
Paras vastaus

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:

  1. Clear your browser cache or try Incognito mode.
  2. If on Odoo.sh or On-Prem, rebuild assets with:
    ./odoo-bin -d your_db -u base --assets
  3. Undo any recent Studio or custom module changes.
  4. If on Odoo Online (SaaS), contact Odoo Support with the error.
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Dhrumi (Wan Buffer Services)
Paras vastaus

Solution Checklist:

  1. Enable Developer Mode
    Go to Settings > Activate Developer Mode to view technical details of errors.
  2. Check Logs for Full Traceback
    If you're using a self-hosted instance, check your terminal or log file (usually in /var/log/odoo/ or terminal output) for the complete error traceback. This is key to identifying what’s wrong.
  3. Common Beginner Issues:
    • Missing dependencies after custom module install
    • Access rights or group permission errors
    • Syntax errors in Python/manifest files if you installed a custom app
  4. How to Get Better Help:
    Please provide:
    • The exact error message
    • Your Odoo version (e.g., Odoo 16 Community)
    • Whether you installed any custom apps before the error appeared

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