Why am I getting this error: Cannot create a record in ZIP/postal Codes (Table). ZIP/postal Code: , . The record already exists
I try to import records from a .txt-file into a table in: Administration > Administration Area > Periodic > Data export/import > Definition Groups

I've made a new Definition Group, set the name and type (Custom) of it and Selected the Default file name.

In the Table setup I deleted all records and selected the table where I want to import the records, Import status = Import.

After clicking on the import-button in the Definition group-window I'm facing this error and no data is imported -->
ERROR: Cannot create a record in ZIP/postal Codes (CLIAddressZipCode). ZIP/postal Code: , .
The record already exists.

I tried everything: I deleted all data in that table, synchronized it but without success.

Can someone help me please?
Why am I getting this error: Cannot create a record in ZIP/postal Codes (Table). ZIP/postal Code: , . The record already exists
===

I try to import records from a .txt-file into a table in: Administration > Administration Area > Periodic > Data export/import > Definition Groups

I've made a new Definition Group, set the name and type (Custom) of it and Selected the Default file name.

In the Table setup I deleted all records and selected the table where I want to import the records, Import status = Import.

After clicking on the import-button in the Definition group-window I'm facing this error and no data is imported -->
ERROR: Cannot create a record in ZIP/postal Codes (CLIAddressZipCode). ZIP/postal Code: , .
The record already exists.

I tried everything: I deleted all data in that table, synchronized it but without success.

Can someone help me please?