Ayuda con PHP 8.0

Ola que tal bueno tengo un problema cuando yo quiero subir un theme lo cargo a la carpeta THEMES pero cuando lo habilito para verlo me salta el siguente error....

Warning: themeheader(banners.php) [ function.themeheader]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 79

Warning: themeheader(banners.php) [function.themeheader]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 79

Warning: themeheader(banners.php) [function.themeheader]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 79

Warning: themeheader() [function.include]: Failed opening 'banners.php' for inclusion (include_path='.:/usr/local/lib/php') in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 79

Warning: file(themes/Mtechnik_Ambient/header.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 97

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 97

Warning: file(themes/Mtechnik_Ambient/blocks.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: file(themes/Mtechnik_Ambient/blocks.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: file(themes/Mtechnik_Ambient/blocks.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: file(themes/Mtechnik_Ambient/blocks.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: file(themes/Mtechnik_Ambient/blocks.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 209

Warning: file(themes/Mtechnik_Ambient/left_center.html) [function.file]: failed to open stream: No such file or directory in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 104

Warning: implode() [function.implode]: Bad arguments. in /home/codexel/public_html/portall/themes/DeepBlue/theme.php on line 104


Quisiera saber a que se debe esta lista de errores... desde ya muchas gracias.