Error when tried to install Mautic 3.3.3, The site is currently offline due to encountering an error

Hi Everyone,

Your software
My Mautic version is: 3.3.3
My PHP version is: 7.3
My Database type and version is: MySQL 5.6

Your problem
My problem is: I tried to install Mautic 3.3.3 on my web server, but I get the following error message:

The site is currently offline due to encountering an error. If the problem persists, please contact the system administrator.

System administrators, check server logs for errors.

These errors are showing in the log:
[2021-05-19 11:55:44] mautic.ERROR: Symfony\Component\Translation\Exception\InvalidResourceException: Invalid resource provided: “1.2”; Errors: [ERROR 41] Specification mandate value for attribute xp (in n/a - line 1690, column 19) [ERROR 65] attributes construct error (in n/a - line 1690, column 19) [ERROR 73] Couldn’t find end of Start Tag field line 1690 (in n/a - line 1690, column 19) [ERROR 77] Premature end of data in tag key line 1688 (in n/a - line 1690, column 19) [ERROR 77] Premature end of data in tag element line 1665 (in n/a - line 1690, column 19) [ERROR 77] Premature end of data in tag schema line 31 (in n/a - line 1690, column 19) [ERROR 3067] Failed to parse the XML resource ‘in_memory_buffer’. (in n/a - line 0, column 0). - in file /home/digitcx/www/newsletter/vendor/symfony/translation/Loader/XliffFileLoader.php - at line 197

Steps I have tried to fix the problem: I uploaded the files a couple of time, I tried to install version 3.3.2 as well, but the same error.

Could you help please?

Thanks