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I receive the following error in Google Web master tools
Parent tag: url
Tag: lastmod
Value: 0001-01-01
Problem detected on: Dec 18, 2010
I have had no problems the last couple of years but recently 900 Google indexed pages have been dropped. I expect it is from the error above.
I am using version 1.6 and have swapped out SEO files with original in hopes of a fix but no avail.
Any help is appreciated.