WARNING: Thelen2003Muscle::computeInitialFiberEquilibrium(SimTK::State& s)

[Saadia Talay]

Hi! I am trying to simulate the LLSM in OpenSim (https://simtk.org/projects/llsm/) and I get the following error for multiple muscles:

WARNING: No suitable initial conditions found for
ADD_LONG_5_R:
by

WARNING: Thelen2003Muscle::computeInitialFiberEquilibrium(SimTK::State& s)
Continuing with an initial fiber force and length of 0 and 0.105730
Here is a report from the routine:

Solution Error : 3696554.733092 > tol (0.000003)
Newton Iterations : 200 of max. iterations (200)
Check that the initial activation is valid, and that the whole
length doesn't produce a pennation angle of 90 degrees, nor a fiber
length less than 0:
Activation : 0.050000
Whole muscle length : 1.#QNAN0



Any idea how I can fix this?