WEB SERVER ERROR 500 - GATEWAY DETECTION - FORTIMANAGER

[hervaltelecom]

Hello!

I am receiving and error when a try to alter GATEWAY DETECTION on Fortimanager, the error is:

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An error occurred for the URL:

/cgi-bin/module/sharedobjmanager/router/SOMRouterGwdetectDlg The request generated an internal server error.

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After configuring it for the first time it says UNDEFINED, on the Interface and if i try to delete or even add a new one i get this error. 

Im on a FORTIMANAGER v5.0-build0121 130201 (GA PATCH 1)

The Fortigate is a 60D on firmware 5.0.13 |(0322)

Any help would be appreciated.