I'm using 6.40 and in WED, I created a hollow cube, added a model and attach the dumb AI template to it. The level can compile but when run, I get the following errors:
Code:

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< (passable_ent == null) >
bipedPhy01.wdl 375:0 Error(63): Parameter unknown passable_ent

< if(bipedPhy01_temp_ent != NULL) {>
bipedPhy01.wdl 389:0 Error(19): Parameter unknown if bad keyword in { }

< if(gid01_platform_const == bipedPhy01_temp_ent._gid01_id) {c,trace_mode)>
bipedPhy01.wdl 391:-1 Error(6): Script error

< vec_sec(bipedPhy01_surface_vel_vec[0],bipedPhy01_temp_ent._gid01_vel_x);>
bipedPhy01.wdl 389:0 Error(19): Parameter unknown vec_set bad keyword in { }

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Here's the Notes tab info:
Code:

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Project Manager: 1.4
Template: Template 6
	Type: WDL Script
	Date: 060519
	Vers: 6.6
	Req: 6.40.5

Main Script: C:\Documents and Settings\user\Desktop\test\work\test2.wdl

gid01.wdl  (4.6) (060518)
display00.wdl  (4.6) (060518)
bipedPhy01.wdl  (4.6) (060518)
bipedAnim01.wdl  (4.6) (060518)
bipedSnd01.wdl  (4.6) (060518)
aiDumbBiped01.wdl  (4.6) (060518) 

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