This error means that at least one row in your Pickup_withoutproxy2.txt file has a value in its first column that is larger than an int (your PickupId field).
An Int can only accept values between -2147483648 to 2147483647.
Review your data to see what’s going on. You could try to load it into a temp table with a varchar data type if your txt file is extremely large and difficult to see. Easy enough to check for an int once loaded in the database.
Good luck.