Installation of modules

Hi,

Please I need help.
I installed freepbx 2.5.1.1 and I need to install some modules and upgrade some others. But when I clic on the orange top bar, I have error message. " [FATAL] Asterisk Manager Connection Failure Failed to connect to the Asterisk manager through port: 5038" and I don’t know why.
Please I need help.
Warmly tikos