Error during export thru VBA

Hi: when i try to export data into textfile thru VBA it gives a message. But same thing if i go to the table and right click
and export there is no error. My question is why it gives me that error when i try to export thru VBA code?

Microsoft Access was unable to append all the data to the table.
The contents of fields in 1 record(s) were deleted, and 0 records were lost due to key violations. If data was deleted, the
data you pasted or imported doesn't match the field data type or the FieldSize property in the destination table.
If records were lost, either the records you pasted contain primary key values that already exist in the destination table,
or they violate referential integrity rules for relationship defined between tables.
Do you want to proceed any way?

DoCmd.TransferText acExportDelim, , "Qry_AlltblCustomersExport", "C:\MailSave\KDB_tblCustomers.txt"

SELECT tblCustomers_Export.FormCode, tblCustomers_Export.Corp, tblCustomers_Export.House, tblCustomers_Export.Cust,
tblCustomers_Export.Name, tblCustomers_Export.Street, Left([CityStateZip],InStr([CityStateZip],",")-4) AS City,
Mid([CityStateZip],InStr([CityStateZip],",")-2,2) AS State, Trim(Mid([CityStateZip],InStr([CityStateZip],",")+1)) AS Zip
FROM tblCustomers_Export;

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jefftwilleyConnect With a Mentor Commented:
If the code you're using is part of a larger function, or series of them, then there is a problem somewhere else. You're not running an append query...yours is select.
If you step through the code, is the part you're pasting in where it fails?
You should not get append errors with an export

DoCmd.TransferText acExportDelim, "", Qry_AlltblCustomersExport", "C:\MailSave\KDB_tblCustomers.txt", False, ""
mustish1Author Commented:
I try it but it gives same error
DoCmd.TransferText acExportDelim, "", "Qry_AlltblCustomersExport", "C:\MailSave\KDB_tblCustomers.txt", False, ""
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