I have installed Lead Capture App for Facebook in Sandbox.
 
But when Tried clicking on Lead Capture App below message appeared:
 
You are not authorized to access this page. Please contact your salesforce.com administrator for more information or raise a support case at help.salesforce.com, providing the following identifier for further investigation: 94c78f56-7df8-472d-b634-7b49ed2c3b73.

Please help

You are not authorized to access this page. Please contact your salesforce.com administrator for more information or raise a support case at help.salesforce.com, providing the following identifier for further investigation: 57c64c75-4ba6-4c9d-974c-1e7d6f1e4bd5.

You are not authorized to access this page. Please contact your salesforce.com administrator for more information or raise a support case at help.salesforce.com, providing the following identifier for further investigation: 57c64c75-4ba6-4c9d-974c-1e7d6f1e4bd5.