Gravity Analog 20A current sensor - SEN0214 - ERROR

Hi,
I recently purchased SEN0214,
the only code i could find was from here:
https://wiki.dfrobot.com/20A_Current_Sensor_SKU_SEN0214
however there seems to be a few errors lines 50, 53 and 54
Maybe this is i +1?
see attached photos of setup, arduino mega , connected to a small dc motor running on 12v, connected sen0214 to AO. however nothing is showing on the serial port? have reconfigured to Serial.begin(9600);
any pointers?
Yes you are right. The blank in the sample code is the “+”. And we have update in our wiki.
But I just noticed that you connect the positive pin to the AREF or D13?
Could you try to connect the positive pin to 5V on your Mega?

the photo is an illusion pins are going to 5v, gnd, and A0. your updated code is now working. Thank you. Can this module SEN0214 monitor voltage as well?