[ns] invalid command name "Agent/GPSR"

[Nourideen A]

Hi, Im getting issues when adding the GPSR Agent , I keep getting these
errors:

$ ns hls.tcl

invalid command name "Agent/GPSR"

    while executing

"Agent/GPSR set bdesync_                0.5 "

    (file "hls.tcl" line 6)

Thanks.