Couldn't generate code for the following reason:
Language description requires that MathML operator divide has 2 arguments, but it actually has 1; 
  In MathML apply element.
  In MathML math element.
  In CellMLComponent element with name i_CaL_fL_gate.
  In Model element with name Loewe_Lutz_Fabbri_Severi_human_sinus_node_model.