Code 1
Unable to open input file <filename>

Code 2
Missing field <name> on line <line>
Empty string in field <name> on line <line>
Invalid integer in field <name> on line <line>
Overflow integer in field <name> on line <line>
Malformed integer in field <name> on line <line>
Integer out of range <min, max> in field <name> on line <line>