Prestashop error 500 Compile Error: Access level to Inix2Module::displayInformation() must be public (as in class ModuleCore)

Made the aupgrade of Prestashop to lasted version. When click on "module catalog" or "payments" and other options I get an 500 error. On debug mod I get: Compile Error: Access level to Inix2Module::displayInformation() must be public (as in class ModuleCore) Symfony\Component\Debug\Exception\ FatalErrorException in modules/inixframe/[login to view URL] (line 4250) { $flash_key = $this->name . '_flash_message'; $this->context->cookie->unsetFamily($flash_key); }}