[invision] errori php

io ho gia installato quella invision ma mi da questo errore

Warning: main() [function.main]: Unable to access ../sources/ipsclass.php in /membri/supersharing/forum/index.php on line 89

Warning: main(../sources/ipsclass.php) [function.main]: failed to open stream: No such file or directory in /membri/supersharing/forum/index.php on line 89


Warning: main() [function.main]: Unable to access ../sources/ipsclass.php in /membri/supersharing/forum/index.php on line 89

Warning: main(../sources/ipsclass.php) [function.main]: failed to open stream: No such file or directory in /membri/supersharing/forum/index.php on line 89

Controlla che il file in questione, ossia ipsclass.php, sia realmente presente, nella cartella sources, in ambedue i casi, prova ricaricarlo.