Model is unsuitably constrained (i.e. there were still some variables left to be computed, and some unusable equations left over). At the time of the error, the following variables were found: * Defined: time in component environment * Defined: V in component membrane * Defined: R in component membrane * Defined: T in component membrane * Defined: F in component membrane * Undefined: dV_dt in component membrane * Undefined: IStimC in component membrane * Defined: Cm in component membrane * Undefined: I_st in component membrane * Defined: i_Na in component fast_sodium_current * Defined: i_Ca_L in component L_type_Ca_channel * Defined: i_K in component time_dependent_potassium_current * Defined: i_NaCa in component Na_Ca_exchanger * Defined: i_K1 in component time_independent_potassium_current * Defined: i_Kp in component plateau_potassium_current * Defined: i_p_Ca in component sarcolemmal_calcium_pump * Defined: i_Na_b in component sodium_background_current * Defined: i_Ca_b in component calcium_background_current * Defined: i_NaK in component sodium_potassium_pump * Defined: i_ns_Ca in component non_specific_calcium_activated_current * Defined: E_Na in component fast_sodium_current * Defined: g_Na in component fast_sodium_current * Defined: Nai in component ionic_concentrations * Defined: Nao in component ionic_concentrations * Defined: m in component fast_sodium_current_m_gate * Defined: h in component fast_sodium_current_h_gate * Defined: j in component fast_sodium_current_j_gate * Defined: alpha_m in component fast_sodium_current_m_gate * Defined: beta_m in component fast_sodium_current_m_gate * Defined: alpha_h in component fast_sodium_current_h_gate * Defined: beta_h in component fast_sodium_current_h_gate * Defined: alpha_j in component fast_sodium_current_j_gate * Defined: beta_j in component fast_sodium_current_j_gate * Defined: i_CaCa in component L_type_Ca_channel * Defined: i_CaK in component L_type_Ca_channel * Defined: i_CaNa in component L_type_Ca_channel * Defined: gamma_Nai in component L_type_Ca_channel * Defined: gamma_Nao in component L_type_Ca_channel * Defined: gamma_Ki in component L_type_Ca_channel * Defined: gamma_Ko in component L_type_Ca_channel * Defined: I_CaCa in component L_type_Ca_channel * Defined: I_CaK in component L_type_Ca_channel * Defined: I_CaNa in component L_type_Ca_channel * Defined: P_Ca in component L_type_Ca_channel * Defined: P_Na in component L_type_Ca_channel * Defined: P_K in component L_type_Ca_channel * Defined: gamma_Cai in component L_type_Ca_channel * Defined: gamma_Cao in component L_type_Ca_channel * Defined: Cai in component ionic_concentrations * Defined: Cao in component ionic_concentrations * Defined: Ko in component ionic_concentrations * Defined: Ki in component ionic_concentrations * Defined: d in component L_type_Ca_channel_d_gate * Defined: f in component L_type_Ca_channel_f_gate * Defined: f_Ca in component L_type_Ca_channel_f_Ca_gate * Defined: alpha_d in component L_type_Ca_channel_d_gate * Defined: beta_d in component L_type_Ca_channel_d_gate * Defined: d_infinity in component L_type_Ca_channel_d_gate * Defined: tau_d in component L_type_Ca_channel_d_gate * Defined: alpha_f in component L_type_Ca_channel_f_gate * Defined: beta_f in component L_type_Ca_channel_f_gate * Defined: f_infinity in component L_type_Ca_channel_f_gate * Defined: tau_f in component L_type_Ca_channel_f_gate * Defined: Km_Ca in component L_type_Ca_channel_f_Ca_gate * Defined: g_K_max in component time_dependent_potassium_current * Defined: g_K in component time_dependent_potassium_current * Defined: E_K in component time_dependent_potassium_current * Defined: PR_NaK in component time_dependent_potassium_current * Defined: X in component time_dependent_potassium_current_X_gate * Defined: Xi in component time_dependent_potassium_current_Xi_gate * Defined: alpha_X in component time_dependent_potassium_current_X_gate * Defined: beta_X in component time_dependent_potassium_current_X_gate * Defined: E_K1 in component time_independent_potassium_current * Defined: g_K1_max in component time_independent_potassium_current * Defined: g_K1 in component time_independent_potassium_current * Defined: K1_infinity in component time_independent_potassium_current_K1_gate * Defined: alpha_K1 in component time_independent_potassium_current_K1_gate * Defined: beta_K1 in component time_independent_potassium_current_K1_gate * Defined: E_Kp in component plateau_potassium_current * Defined: g_Kp in component plateau_potassium_current * Defined: Kp in component plateau_potassium_current * Defined: K_mpCa in component sarcolemmal_calcium_pump * Defined: I_pCa in component sarcolemmal_calcium_pump * Defined: g_Nab in component sodium_background_current * Defined: E_NaN in component sodium_background_current * Defined: g_Cab in component calcium_background_current * Defined: E_CaN in component calcium_background_current * Defined: I_NaK in component sodium_potassium_pump * Defined: f_NaK in component sodium_potassium_pump * Defined: K_mNai in component sodium_potassium_pump * Defined: K_mKo in component sodium_potassium_pump * Defined: sigma in component sodium_potassium_pump * Defined: i_ns_Na in component non_specific_calcium_activated_current * Defined: i_ns_K in component non_specific_calcium_activated_current * Defined: P_ns_Ca in component non_specific_calcium_activated_current * Defined: I_ns_Na in component non_specific_calcium_activated_current * Defined: I_ns_K in component non_specific_calcium_activated_current * Defined: K_m_ns_Ca in component non_specific_calcium_activated_current * Defined: Vns in component non_specific_calcium_activated_current * Defined: EnsCa in component non_specific_calcium_activated_current * Defined: K_NaCa in component Na_Ca_exchanger * Defined: K_mNa in component Na_Ca_exchanger * Defined: K_mCa in component Na_Ca_exchanger * Defined: K_sat in component Na_Ca_exchanger * Defined: eta in component Na_Ca_exchanger * Undefined: i_rel in component calcium_fluxes_in_the_SR * Defined: i_up in component calcium_fluxes_in_the_SR * Defined: i_leak in component calcium_fluxes_in_the_SR * Defined: i_tr in component calcium_fluxes_in_the_SR * Undefined: G_rel in component calcium_fluxes_in_the_SR * Undefined: G_rel_peak in component calcium_fluxes_in_the_SR * Defined: G_rel_max in component calcium_fluxes_in_the_SR * Defined: tau_on in component calcium_fluxes_in_the_SR * Defined: tau_off in component calcium_fluxes_in_the_SR * Undefined: t_CICR in component calcium_fluxes_in_the_SR * Defined: tau_tr in component calcium_fluxes_in_the_SR * Defined: K_mrel in component calcium_fluxes_in_the_SR * Defined: K_mup in component calcium_fluxes_in_the_SR * Defined: K_leak in component calcium_fluxes_in_the_SR * Defined: I_up in component calcium_fluxes_in_the_SR * Defined: Ca_NSR_max in component calcium_fluxes_in_the_SR * Undefined: delta_Ca_i2 in component calcium_fluxes_in_the_SR * Defined: delta_Ca_ith in component calcium_fluxes_in_the_SR * Defined: Ca_JSR in component ionic_concentrations * Defined: Ca_NSR in component ionic_concentrations * Defined: Am in component ionic_concentrations * Defined: V_myo in component ionic_concentrations * Defined: V_JSR in component ionic_concentrations * Defined: V_NSR in component ionic_concentrations * Undefined: d/dt V in component membrane * Defined: d/dt m in component fast_sodium_current_m_gate * Defined: d/dt h in component fast_sodium_current_h_gate * Defined: d/dt j in component fast_sodium_current_j_gate * Defined: d/dt d in component L_type_Ca_channel_d_gate * Defined: d/dt f in component L_type_Ca_channel_f_gate * Defined: d/dt X in component time_dependent_potassium_current_X_gate * Defined: d/dt Nai in component ionic_concentrations * Undefined: d/dt Cai in component ionic_concentrations * Defined: d/dt Ki in component ionic_concentrations * Undefined: d/dt Ca_JSR in component ionic_concentrations * Defined: d/dt Ca_NSR in component ionic_concentrations The following equations couldn't be used: * Equation in apply element with id dV_dt_eq. * Equation in apply element with id membrane_voltage_diff_eq. * Equation in apply element with id IStim_for_cmiss. * Equation in apply element with id i_rel_calculation. * Equation in apply element with id G_rel_calculation. * Equation in apply element with id G_rel_peak_calculation. * Equation in apply element with id calcium_internal_diff_eq. * Equation in apply element with id calcium_JSR_diff_eq.