PI Channels start/stop buttons are greyed out

hi friends,

I could not able to control channels as all buttons start/stop/automatic control are greyed out.

even rwb -mdt is giving an error.

"error: error in compiling [/mdt/channelmonitorservlet] in application [sap.com/com.sap.xi.mdt2].

we have installed new PI7.3 system.(abap+java). can you please help me if any body have faced this issue.

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regards,

loordh.