wmctrl move window to workspace

I am trying to use wmctrl to move a window to a workspace. By wmctrl -l window is 0x03e00057 9 meer montazo - Google Search — Mozilla Firefox Command and output is /usr/local/bin/wmctrl -v -i 0x03e00057 -t 3 envir_utf8: 0 No window was specified. My understanding is that -i points to the hex id of the window (first field in the output list?), which in my simple mind i am doing here. Where am I astray?