From: kang hongchao on
Hello, i am a newer ,this is a problem when i learn a example, when i simulated it ,there always are warnings such as:

Warning: Matching "Goto" for "From" 'untitled/DC Machine/iA/source' not found.
Warning: Matching "Goto" for "From" 'untitled/DC Machine/iF/source' not found.
Warning: Matching "From" for "Goto" 'untitled/DC Machine/FCEM/Goto' not found.
Warning: Matching "From" for "Goto" 'untitled/DC Voltage Source/Goto' not found.
Warning: Using a default value of 0.02 for maximum step size. The simulation step size will be limited to be less than this value.

now, i can not sovle the problem, so i need you help , thank you !