Erro no shopping V3

[hidy]

Salve galera, já faz um tempo que eu não mexo com Mu, esto ajudando um amigo a por shopping V3 online que foi liberado, só que ele esta dando erro na hospedaegm,

Warning: session_start() [function.session-start]: open(./tmp\sess_785b6a8f12c66ca3b899f1ffee3a71ea, O_RDWR) failed: Permission denied (13) in E:\Inetpub\vhosts\mumagnus.net\httpdocs\shopcash\index.php on line 5

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at E:\Inetpub\vhosts\mumagnus.net\httpdocs\shopcash\index.php:5) in E:\Inetpub\vhosts\mumagnus.net\httpdocs\shopcash\index.php on line 5

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at E:\Inetpub\vhosts\mumagnus.net\httpdocs\shopcash\index.php:5) in E:\Inetpub\vhosts\mumagnus.net\httpdocs\shopcash\index