This issue is in parameters.php (location defined in /tool/parametersLocation.php)

It seems DB password is incorrect.

Thanks for your quick answer, but my problem is exactly that i have not parameterlocation.php
i have not this file
i check in tool liberary and i didnot find it. last time when i contatct to projeqtor they told me this a problem about unzipping zip file and read only attribution file. i changed attribution to read-write and it works. but this time i have not parameterlocation .php
thanks

If it is a first install, it is normal, this file is not deplyed.
It is created on configuration.
For first install, best is to give write rights to whole propjeqtor folder for php user (www-data on linux/debian like)

If it is migration, this happens if you dont' follow migration procedure : you must overwrite existing code with new one, so parametersLocation.php still exists.

this is a first installation after installing my new operation system.
I changed all projeqtor folder from read only to read-write but i saw always the same message about access denied. in first configuration interface i must change anything? about user and password?
Actualy User :root
Pas: mysql

Try without a password (this is default configuration of MySql on windows)

ok . but i use mac

whatever the os, try without password.
Otherwise, just use the password you defined on install for root user, or create dedicated user.

it works, without password, it's ridiculous!!
thanks for your help