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404 error means that the link you have provided is not there.
on your links page I can see 4 of these and 2 that are OK.
may I suggest that you edit the 4 that don't work. I presume you made these with the text widget. In that case highlight the heading to be linked again and select the link editor from the edit menu. This will bring up a dialogue box and one of the options will be to link to another URL. Type in the URL and OK. That's it.
Get back if there's something that you need help with.