Error Push Update from Altiris Client 7.5 to 7.6

Hello:

We recently had update our Altiris Server from 7.5 version to 7.6 version. But the clients there are in the version 7.5.

When I tried to push the Symantec Management Agent to my Clients using Altiris Server I received the next error message:

"Failed to push Symantec Management Agent. Error: 1722"

¿ Can you help me please ?

Thanks.