Paypal problem

I have a problem with paypal at step 2. When I am trying to fund project, I have a communicat: “Fatal error: Uncaught exception ‘Exception’ with message ‘Preapproval failed: The X-PAYPAL-APPLICATION-ID header contains an invalid value’ in /wordpress/wp-content/themes/funding_press/funding/paypal.php:100 Stack trace: #0 /wordpress/wp-content/themes/funding_press/funding/funding.php(217): F_PayPal->get_auth_url(Object(WP_Post), Object(WP_Post), Object(WP_Post)) #1 [internal function]: F_Controller->action_template_redirect(”) #2 /wordpress/wp-includes/plugin.php(406): call_user_func_array(Array, Array) #3 /wordpress/wp-includes/template-loader.php(7): do_action(‘template_redire…’) #4 /wordpress/wp-blog-header.php(16): require_once(‘/wordpress/wp-i…’) #5 /wordpress/index.php(17): require(‘/wordpress/wp-b…’) #6 {main} thrown in /wordpress/wp-content/themes/funding_press/funding/paypal.php on line 100″

Could you help me?