solve third order ode and find a error: Cannot feed value of shape (40,) for Tensor Placeholder_19:0, which has shape (None, 2)

Question

code given the error: Cannot feed value of shape (40,) for Tensor Placeholder_19:0, which has shape (None, 2)

I am trying to do a code of solving third order ode system and I am having some issues. Namely, I am getting the following error: Cannot feed value of shape (40,) for Tensor Placeholder_19:0, which has shape (None, 2)