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Envelope disappears when opening sketchup

I get this message when I open up Sketchup. My colored envelope boxes disappear after I click OK. When I recheck the layers I cant restore it. Help please!image description

Envelope disappears when opening sketchup

I get this message when I open up Sketchup. My colored envelope boxes disappear after I click OK. When I recheck the layers I cant restore it. Help please!image description