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[error]  Security warning: Couldn't write .htaccess file. Please create a .htaccess file in your ../config/sync directory which contains the following lines: <pre><code># Deny all requests 
from Apache 2.4+.                                                                                                                                                                             
<IfModule mod_authz_core.c>                                                                                                                                                                   
  Require all denied                                                                                                                                                                          
</IfModule>                                                                                                                                                                                   
                                                                                                                                                                                              
# Deny all requests from Apache 2.0-2.2.                                                                                                                                                      
<IfModule !mod_authz_core.c>                                                                                                                                                                  
  Deny from all                                                                                                                                                                               
</IfModule>                                                                                                                                                                                   
                                                                                                                                                                                              
# Turn off all options we don't need.                                                                                                                                                         
Options -Indexes -ExecCGI -Includes -MultiViews                                                                                                                                               
                                                                                                                                                                                              
# Set the catch-all handler to prevent scripts from being executed.                                                                                                                           
SetHandler Drupal_Security_Do_Not_Remove_See_SA_2006_006                                                                                                                                      
<Files *>                                                                                                                                                                                     
  # Override the handler again if we're run later in the evaluation list.                                                                                                                     
  SetHandler Drupal_Security_Do_Not_Remove_See_SA_2013_003                                                                                                                                    
</Files>                                                                                                                                                                                      
                                                                                                                                                                                              
# If we know how to do it safely, disable the PHP engine entirely.                                                                                                                            
<IfModule mod_php7.c>                                                                                                                                                                         
  php_flag engine off                                                                                                                                                                         
</IfModule></code></pre> [1.27 sec, 32.41 MB] 

Debug and figure out the warning and check if it relevant to nginx as well