Hi peckmon4. Your little people will not be able to take the sock from the blue room to the washer until they believe they have a "clear path," even if the path looks clear to us. The arrow points to the item that needs to be moved in order to provide the clear path. Open the Decor Tab, move the item (sometimes it just needs to be moved a tiny bit), close the Decor Tab and drop a little person on the sock again. If the message pops up again, move the item the arrow is pointing to. If it's the same item, move the item some more.
I'd love to see your screenshot. Instructions on how to post a screenshot are
here. Instructions on using the File Manager is about 1/2 way through the post. Have fun with your little family!