Deciphering the Downloader error messages

About 15-20% of the 6600 stocks I'm downloading EOD data for have errors. Does this mean that I am receiving bad data?

A common reason for not being able to update various securities is that symbols change or are deleted from the exchange. In this case, simply delete the invalid symbols. Make sure you have an up to date symbol file. Understand that some of the ‘errors’ might simply be a ‘warning’ that something needs your attention. In Downloader, go to TOOLS | TEST and select a folder. If you click on Options, every error code is listed there with the explanation for it. For example:

Error #1101: Security has not traded for at least the last 31 days.

This might mean that the companies have merged or gone out of business.

Error #1090: There was a large change in the close on that date.

Errors #1010 & 1035: Problems with the Company names.

These were caused because of a period included after ‘Inc” in the company name. Change ‘Sample, Inc.’ to ‘Sample, Inc’ to clear up this error.