Invalid Keywords calculation

For KeyWords to calculate the key-words in a text file by comparing it with a reference corpus, both must be in the same language and both must be sorted in the same way (alphabetical order, ascending). If you see this message you are trying to compute KWs without metting these criteria. Solution: open each word-list and check to see it is OK and that it is sorted alphabetically in the same way. Check they have both been made with the same language settings and if necessary re-compute one or both of them.