How to get tendonlimitfrc reading

Hi,

I have a tendon defined inside a default class. I wish to attach tendonlimitfrc sensor to this tendon. According to the description to provided on http://mujoco.org/book/XMLreference.html#sensor-tendonlimitfrc, the sensor requires a tendon name. And according to http://mujoco.org/book/XMLreference.html#default-tendon, tendon can not have a name or class. Given this situation. Request your help to obtain readings for tendonlimitfrc sensor for tendon defined in default.

 

Thanks for your response.

So I have a tendon as follows:

<tendon>
<spatial class="spring_class "name="tendon_spring1">
<site site="_spring_0"/>
<site site="s_spring_1"/>
</spatial>
</tendon>

<sensor>
<tendonlimitfrc name="sensor_wheel_spring" tendon="tendon_spring1"/>
</sensor>

And the error I get is this: Schema violation: unrecognized element\n\nElement 'tendonlimitfrc'