unable to launch dolphin via ssh X11 forwarding

I am new to Linux, hope someone can help.

I am not able to launch dolphin via ssh X11 forwarding under user profile but root.

[INDENT][INDENT]thomas@server1:~> dolphin /home/thomas
<unknown program name>(5402)/: KUniqueApplication: Cannot find the D-Bus session server: “Failed to connect to socket /tmp/dbus-gF8SpEAP82: Connection refused”

<unknown program name>(5401)/: KUniqueApplication: Pipe closed unexpectedly. [/INDENT][/INDENT]

Would anyone have advice please?