Error activating marketing effort: One or more export definitions are not defined: either an export definition must be defined for each package used in the marketing effort, or default export definitions must be selected for the relevant channels
Download and install the latest version and patch, if applicable.
Workaround: After the error is received, navigate to the sponsorship effort and select "Export effort" from the Tasks frame. Specify an export definition for the field that is being required. Save the form and then export the effort.