error #2

hey guys, i have a few error that i have tried to google for a fix but i couldn't find it, i have 7 error i hope you guys don't mind me posting it here for help.
it is for a dating website that i am installing . Hope someone can help me. Thank you ever so much.

Error 1
Warning: fwrite(): supplied argument is not a valid stream resource in /home/------/public_html/admin/inc/class.admin_language.php on line 410
Code
\$_lang_text = array
(\n\n" ); Line 410

Error 2
Warning: fwrite(): supplied argument is not a valid stream resource in /home/-----/public_html/admin/inc/class.admin_language.php on line 417
Code
fwrite( $_fp, "\n);\n\n?>" ); Line 417

Error 3
Warning: fclose(): supplied argument is not a valid stream resource in /home/------/public_html/admin/inc/class.admin_language.php on line 419
Code
fclose( $_fp ); Line 419


Error 4
Warning: readcache(/_cache/lang-1.php): failed to open stream: No such file or directory in /home/therainb/public_html/inc/class.language.php on line 131
Code
include( $this->getCacheFilename( $this->curr_lang_id ) ); Line 131

Error 5
Warning: readcache(): Failed opening '/_cache/lang-1.php' for inclusion (include_path='.:/usr/local/lib/php') in /home/therainb/public_html/inc/class.language.php on line 131
Code
include( $this->getCacheFilename( $this->curr_lang_id ) ); Line 131

Error 6
Warning: Cannot modify header information - headers already sent by (output started at /home/therainb/public_html/admin/inc/class.admin_language.php:400) in /home/therainb/public_html/inc/class.frontend.php on line 123
Code
header( 'Location: '. URL_HOME . 'install.php' ); Line 123

and finaly "and i hope the last"

Error 7
Warning: fopen(/_cache/lang-1.php): failed to open stream: No such file or directory in /home/therainb/public_html/admin/inc/class.admin_language.php on line 400
Code
$_fp = fopen( parent::getCacheFilename( $lang_id ), 'w' ); Line 400


I THANK YOU SO MUCH EVERYONE WHO IS TAKING THE TIME TO GIVE ME A HAND.