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Admin Tools

#42743 JInstaller: :Instalar: Error SQL Table 'cfp406_com.rmq9c_admintools_filescache' doesn't exist

Posted in ‘Admin Tools for Joomla! 4 & 5’
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Environment Information

Joomla! version
6.0.3
PHP version
8.3.8
Admin Tools version
n/a

Latest post by nicholas on Wednesday, 25 February 2026 07:08 CST

Wednesday, 25 February 2026 06:13 CST

patriciomircovich

Hi Akeeba Support team,

I am having trouble installing Admin Tools Pro on my Joomla site (running on an IIS server). I have already resolved previous server-side errors, but the installation process now stops with a specific SQL error.

Environment:

  • CMS: Joomla

  • Server: IIS (Windows)

  • Database: MySQL / MariaDB

The Error: When I try to install the package, I get the following message:

JInstaller: :Install: Error SQL Table 'cfp406_com.rmq9c_admintools_filescache' doesn't exist The extension installation was cancelled.

It seems the installer is looking for this table but cannot find it, preventing the installation from completing. I have tried to re-install the package several times, but the error persists.

Wednesday, 25 February 2026 07:08 CST

nicholas

Joomla has gotten confused as to whether and which version of Admin Tools is installed on your site. This happens due to erroneous recordkeeping in the core Joomla #__schemas table.

If you have any version of Admin Tools (Core or Pro) already installed, please export its configuration.

Go to System, Manage, Extensions.

Expand the Filter Options.  Under "- Select Type -" choose Package.

In the Search box type Admin Tools package (exactly as shown) and click on the magnifier icon.

Select the only extension you see, making sure its Type is listed as Package. This check is crucial.

Click on Actions, Uninstall in the toolbar. Ignore any errors which may be printed.

Install Admin Tools' ZIP package twice in a row, without uninstalling it before or in between.

If you had exported your configuration, you can now import it back into Admin Tools.

Nicholas K. Dionysopoulos

Lead Developer and Director

🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!

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