Upgrade agent?

Hi experts,

I have problems with OEM, every day, appear the agent like "agent unreachable" and I have not information in OEM.

When try to know what happend, I go to "emctl status agent" and appear the error:

Collection Status                            : Disabled by Upload Manager

when I try to "emctl upload agent", appear the error:

.... disk full

Teh disk is not full and it has more than 50% free,

So, I need to recreate the repository again.

Some strange is:

My Oracle version is 11.2.0.3, why the Agent, OMS and Procotol appear with 10.2.0.4.4? Could be a problem? how can upgrade it?

Thanks in advance,

Regards,