Constant Contact plugin forbidden error

I am developing site in local. it works fine. but when i setup that on client server in the join us form after clicking join button the following error occurred.
I am using constant contact api plugin for join us page.

"You don't have permission to access /demo/wp-content/plugins/constant-contact-api/form.php on this server."

I tried setting permissions to 777 temporarily on the setup folder, but that gave me a bigger error. Is this a server problem?

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Or how can i solve this…please guide me…

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