Errors after demo

HI all

I have uploaded the demo and since then im getting serious errors
also made another wordpress site with only the required plugins on the theme without demo and i get the critial error page.

my setup:
PHP
Version 7.4.8
max_execution_time 1200
Overridden at runtime from 30
memory_limit 256M
Overridden at runtime from 40M
upload_max_filesize 20M
post_max_size 8M
display_errors 0
Overridden at runtime from
log_errors 1
Error Reporting 4983
Extensions
66
Database
Server Version 5.5.5
Extension mysqli
Client Version 70408 (7.4.8)
key_buffer_size 134217728 (~128 MB)
max_allowed_packet 268435456 (~256 MB)
max_connections 500
query_cache_limit 1048576 (~1 MB)
query_cache_size 1048576 (~1 MB)
query_cache_type OFF
WordPress
Version 5.4.2
WP_DEBUG false
WP_DEBUG_DISPLAY true
WP_DEBUG_LOG false
SCRIPT_DEBUG false
WP_CACHE false
CONCATENATE_SCRIPTS undefined
COMPRESS_SCRIPTS undefined
COMPRESS_CSS undefined
WP_LOCAL_DEV undefined

on the website with the demo uploaded im getting:

Jul 21, 18:48:24
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 524288 bytes) in /home/bgclanco/public_html/wp-content/themes/blackfyre/addons/icon_addon/icon_addon.php on line 2184
Jul 21, 18:48:48
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/bgclanco/public_html/wp-includes/pomo/mo.php on line 323
Jul 21, 18:48:48
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 135168 bytes) in /home/bgclanco/public_html/wp-includes/pomo/streams.php on line 118
Jul 21, 18:48:57
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/bgclanco/public_html/wp-includes/pomo/mo.php on line 323
Jul 21, 18:48:57
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 135168 bytes) in /home/bgclanco/public_html/wp-includes/pomo/streams.php on line 118
Jul 21, 18:49:56
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/bgclanco/public_html/wp-includes/pomo/mo.php on line 317
Jul 21, 18:49:56
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 135168 bytes) in /home/bgclanco/public_html/wp-includes/pomo/streams.php on line 118
Jul 21, 18:50:13
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/bgclanco/public_html/wp-includes/pomo/mo.php on line 323
Jul 21, 18:50:13
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 20480 bytes) in /home/bgclanco/public_html/wp-includes/pomo/mo.php on line 323
Jul 21, 18:50:13
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 135168 bytes) in /home/bgclanco/public_html/wp-includes/pomo/streams.php on line 118
Jul 21, 18:50:13
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 135168 bytes) in /home/bgclanco/public_html/wp-includes/pomo/streams.php on line 118
Jul 21, 18:51:02
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 151552 bytes) in /home/bgclanco/public_html/wp-content/themes/blackfyre/vc.php on line 1175
Jul 21, 18:51:05
Warning: session_start(): Cannot start session when headers already sent in /home/bgclanco/public_html/wp-content/plugins/wpforo/wpf-includes/class-notices.php on line 16
Jul 21, 18:51:05
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 524288 bytes) in /home/bgclanco/public_html/wp-content/themes/blackfyre/addons/icon_addon/icon_addon.php on line 2184
Jul 21, 18:53:14

also:

Deprecated Array and string offset access syntax with curly braces is deprecated 1
wp-content/themes/blackfyre/functions.php:4149
wp-settings.php
wp-settings.php:508
Notice Undefined index: _checkbox_clan_user 1

wp-content/themes/blackfyre/header.php:70

Core
Notice Trying to access array offset on value of type null 1

wp-content/themes/blackfyre/header.php:70

Core
Notice Undefined index: _checkbox_clan_user 1

wp-content/themes/blackfyre/header.php:112

Core
Notice Trying to access array offset on value of type null 1

wp-content/themes/blackfyre/header.php:112

Core
Notice Undefined variable: css_class 1

wp-content/themes/blackfyre/vc_templates/vc_members_clan_page.php:21

Plugin: js_composer
Deprecated Array and string offset access syntax with curly braces is deprecated 1
wp-content/themes/blackfyre/functions.php:4149