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Hello, I am new to opensim, and I am having an error trying to open the Lumbar_C_238.osim. I keep getting an error that states:

"ModelComponent::getStateVariableSystemIndex: ERR- name '1-L3_r.activation' not found.
for component 'QL_post_I.1-L3_r' of type Thelen2003Muscle"

I am not sure what to do to resolve this issue. Any help would be greatly appreciated.

Hi Corey,

So this error is due to the way the muscle names are written in the files. OpenSim reads dots in a particular type of way. The outcome, in this case, is its cutting off everything before it and then looking for a muscle called "1-L3_r", which doesn't exist.

You will have to go through the model and change dots to underscores for all the muscle names. ie:
"QL_post_I.1-L3_r" becomes "QL_post_I_1-L3_r"

Let us know how it goes,
-james

Hi Mr.Dunne

I have the same error trying to open the Lumbar_C_238.osim. After i change "QL_post_I.1-L3_r" with "QL_post_I_1-L3_r",another error states：

"ModelComponent::getStateVariableSystemIndex: ERR- name '2-L4_r.activation' not found.
for component 'QL_post_I.2-L4_r' of type Thelen2003Muscle"

Likewise, i change "QL_post_I.2-L4_rr" with "QL_post_I_2-L4_r".Then error goes to:

"ModelComponent::getStateVariableSystemIndex: ERR- name '3_r.activation' not found.
for component 'QL_mid_L3-12.3_r' of type Thelen2003Muscle"

It seems to have many wrong muscle names.

I expect you could show the full correct muscle names.Thanks

Forest

You have to go through the model and change ALL the muscles that are affected by this problem. Not just one or two of them. I didn't design the model so I don't have the list of muscles.