Getting problem in paypal payment form

Hello,

I want paypal payment form in my website for selling different products but getting problem,

when i am submitting form error message showing "Invalid PayPal account used. Please contact form owner"

also at the time of adding paypal tool by drag & drop showing error "you can not add more than one payment tool, please delete the existing one first"

can you please help me to solve this problem, how to add paypal email id to get payments???

Thanks

Jas