v8x-v9x Google My Business: Customer Reviews & Ratings (Prestashop) 9.0.2

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[GALOMEN]

How to install a PrestaShop 9 module on PrestaShop 8.1.x (Fix version incompatibility + getTwig error)

If a module refuses to install on PrestaShop 8.1.x and shows a version incompatibility error or the following exception:

Oops... looks like an unexpected error occurred
Attempted to call an undefined method named "getTwig"

it means the module was developed for PrestaShop 9 and requires small compatibility adjustments.

---

Step 1 — Remove version restriction​

1. Download and extract the module ZIP file.
2. Open the main module file (for example: module_name.php).
3. Find the line:

$this->ps_versions_compliancy = ['min' => '9.0', 'max' => '9.9.99'];

1. Replace it with:

$this->ps_versions_compliancy = ['min' => '8.0.0', 'max' => '9.9.99'];

1. Save the file.

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Step 2 — Fix the "getTwig" error (PrestaShop 8 compatibility)​

PrestaShop 8 modules do not include the getTwig() helper expected by some PrestaShop 9 modules.
You must manually add this method.

1. Open the same module file (module_name.php).
2. Scroll to the end of the class.
3. Locate the final closing brace:

}

1. Add the following method BEFORE this line (inside the class).

Example:
The method must be added before the last bracket, for example between lines 950 and 951.

Insert:

/* ===== PS8 compatibility fix ===== */
protected function getTwig()
{
if (class_exists('\PrestaShop\PrestaShop\Adapter\SymfonyContainer')) {
return \PrestaShop\PrestaShop\Adapter\SymfonyContainer::getInstance()->get('twig');
}

throw new \Exception('Twig service not available.');
}
/* ===== end fix ===== */

Make sure the method is added inside the class, not after it.

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Step 3 — Repackage the module​

1. Re-zip the module folder.
2. The ZIP root must contain the module directory itself (not nested folders).
3. Upload the ZIP again via:

Back Office → Modules → Module Manager → Upload a module

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Important Notes​

• This workaround only enables installation on PrestaShop 8.1.x.
• Some modules may still use PrestaShop 9-specific services or APIs.
• Additional small fixes may be required depending on the module.

---

After applying these steps, the module should install and work normally on PrestaShop 8.1.x.