Invalid integer number in feature: '{0}'

Error:

Invalid integer getal in feature: '{0}'.

Explanation:

If the import file contains one or more columns Article Index, Sub-group index and HeaderIndex1..X with a value, the value in those columns must be a positive integer. If not, this error message will appear. The system is then unable to index.

Solution:

Replace the incorrect index notations with positive integers and then import again.