You must enable security settings to allow Conga Composer to interact with your data:

• For each user profile that has access to Conga Composer, ensure the API Enabled setting is active.
• If you want to use Salesforce® Reports as a data source for Composer solutions, ensure that Run Reports and Export Reports are enabled for each user profile that has access to Conga Composer.
  Note:

  Do not set Lock IP Sessions in Salesforce. Doing this will disable Conga Composer from being able to communicate with Salesforce, rendering Conga Composer unusable.