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Dear Experts,

I am new to this forum, I want to build a community forum with MyBB. and I am trying to install in 000webhost first before install in my direct website. when Enable search engine friendly URLs? in my Forum I am getting an error like

404. That’s an error.

The requested URL was not found on this server.

If I try to change htaccess.txt to .htaccess I am not even able to access Admin CP. showing below error.

Application error

An error occurred in the website and your page could not be displayed. If you are the website owner, check your logs for details.

can you please help me how to resolve this issue. your Help is Greatly Appreciated. 

forum URL. https://audile-soldier.000webhostapp.com/
have you checked error log at the web host panel ?

if search engine friendly URLs are turned on then
htaccess.txt file should be renamed as .htaccess

if that is not working then there could be a problem
with mod_rewrite module on your web server. please
contact your webhost to fix that
my hosting says mod_rewrite is enables

can you check if .htaccess is correct

Options -MultiViews +FollowSymlinks -Indexes

#
# If mod_security is enabled, attempt to disable it.
# - Note, this will work on the majority of hosts but on
#   MediaTemple, it is known to cause random Internal Server
#   errors. For MediaTemple, please remove the block below
#
<IfModule mod_security.c>
 # Turn off mod_security filtering.
 SecFilterEngine Off

 # The below probably isn't needed, but better safe than sorry.
 SecFilterScanPOST Off
</IfModule>

#
# MyBB "search engine friendly" URL rewrites
# - Note, for these to work with MyBB please make sure you have
#   the setting enabled in the Admin CP and you have this file
#   named .htaccess
#
<IfModule mod_rewrite.c>
 RewriteEngine on
 RewriteRule ^forum-([0-9]+)\.html$ forumdisplay.php?fid=$1 [L,QSA]
 RewriteRule ^forum-([0-9]+)-page-([0-9]+)\.html$ forumdisplay.php?fid=$1&page=$2 [L,QSA]

 RewriteRule ^thread-([0-9]+)\.html$ showthread.php?tid=$1 [L,QSA]
 RewriteRule ^thread-([0-9]+)-page-([0-9]+)\.html$ showthread.php?tid=$1&page=$2 [L,QSA]
 RewriteRule ^thread-([0-9]+)-lastpost\.html$ showthread.php?tid=$1&action=lastpost [L,QSA]
 RewriteRule ^thread-([0-9]+)-nextnewest\.html$ showthread.php?tid=$1&action=nextnewest [L,QSA]
 RewriteRule ^thread-([0-9]+)-nextoldest\.html$ showthread.php?tid=$1&action=nextoldest [L,QSA]
 RewriteRule ^thread-([0-9]+)-newpost\.html$ showthread.php?tid=$1&action=newpost [L,QSA]
 RewriteRule ^thread-([0-9]+)-post-([0-9]+)\.html$ showthread.php?tid=$1&pid=$2 [L,QSA]

 RewriteRule ^post-([0-9]+)\.html$ showthread.php?pid=$1 [L,QSA]

 RewriteRule ^announcement-([0-9]+)\.html$ announcements.php?aid=$1 [L,QSA]

 RewriteRule ^user-([0-9]+)\.html$ member.php?action=profile&uid=$1 [L,QSA]

 RewriteRule ^calendar-([0-9]+)\.html$ calendar.php?calendar=$1 [L,QSA]
 RewriteRule ^calendar-([0-9]+)-year-([0-9]+)-month-([0-9]+)\.html$ calendar.php?calendar=$1&year=$2&month=$3 [L,QSA]
 RewriteRule ^calendar-([0-9]+)-year-([0-9]+)-month-([0-9]+)-day-([0-9]+)\.html$ calendar.php?action=dayview&calendar=$1&year=$2&month=$3&day=$4 [L,QSA]
 RewriteRule ^calendar-([0-9]+)-week-(n?[0-9]+)\.html$ calendar.php?action=weekview&calendar=$1&week=$2 [L,QSA]

 RewriteRule ^event-([0-9]+)\.html$ calendar.php?action=event&eid=$1 [L,QSA]

 <IfModule mod_env.c>
 SetEnv SEO_SUPPORT 1
 </IfModule>
</IfModule>

#
# If Apache is compiled with built in mod_deflade/GZIP support
# then GZIP Javascript, CSS, HTML and XML so they're sent to
# the client faster.
#
<IfModule mod_deflate.c>
 AddOutputFilterByType DEFLATE text/css text/html application/xhtml+xml text/xml application/xml text/plain text/x-component application/javascript application/x-javascript application/rss+xml application/atom+xml application/json application/manifest+json application/x-web-app-manifest+json application/vnd.ms-fontobject application/font-sfnt application/font-woff application/font-woff2 image/svg+xml image/x-icon
</IfModule>

# Note: You are able to choose a different name in the Admin CP. If you've done that you need to change it here too
<Files "error.log">
 Order Deny,Allow
 Deny from all
</Files>
it is regularly used .htaccess file.

would you like to PM me temporary access to your webhost panel & forum admin panel
also you may have to temporarily remove the security measures for your web host panel login