lynx

hi i use to 15 days try version. and i like whmcs. but i have got some pleblems Firstly; i manage my server ( i select plesk,and i write my admin name,and pass of plesk), than i open a new packeage in plesk,i config the pakage on "my products in whmcs panel". but i try a buy the product,but it is not automaticaly open in plesk. the error is; Server Command Error 1014 - Parser error: Request is invalid i hope, you can understand and help me. thanks