VMware Workspace gateway-va URL login Error

I have successfully installed VMware Workspace suites and finished configuration.

Done everything till this step:

and I tried to use https://gateway-va.cloudseclab.com/hc/login/ ( gateway-va.cloudseclab.com is FQDN of the gateway of my Workspace) ,login and enable View Mode in the next day (that is, last friday).

and it's ok to login.

Then I met some troubles while enabling the View Mode, for an error "connection server invalidation failed", which I either don't know why. (P.S. I have checked every mentioned problem that may cause this error and still failed to fix it.) So, I left it to be fixed Monday.

Strangely, today, I get this when trying to login as admin.

Error

Application Manager encountered an error.
Please contact customer service and provide the information displayed below.

Does anyone can help me with this？ Thanks in advance.