Since you are using SQL 2014 you are probably being bitten by the new security features introduced in 2012.

Your user's login most likely doesn't have access to the SSISDB catalog (even though he might have access to SQL Server).
You need to map the login to an SSISDB user and configure access to the SSISDB folders/projects in Integration Services.

Please have a look at this MSDN blog post SSIS Catalog Access Control Tips and SQL 2012 SSIS Catalog Permissions

Since you are getting the error when saving and not executing the package, you are using SQL 2014 you are probably being bitten by the new security features introduced in 2012.

Your user's login most likely doesn't have access to the SSISDB catalog (even though he might have access to SQL Server).
You need to map the login to an SSISDB user and configure access to the SSISDB folders/projects in Integration Services.

Please have a look at this MSDN blog post SSIS Catalog Access Control Tips and SQL 2012 SSIS Catalog Permissions