Generate error message how to solve ?

Using Arduino Programming Questions
1

this code generate error msg

plz help me

here me add my new repaired code in file

here me try to do add one rfid card for payment purpose. when customer scan that card total amount deducted so here me save 1800 (credit purposes)

main.ino (6.83 KB)

2 
Serial.println(Thank You);

You can't have a space in a variable name.

char Thank;