Oracle Message LPX-00100 - root element ~1S does not match DTD root ~2S

ERROR	root element ~1S does not match DTD root ~2S
CAUSE	Validity Constraint 2.8 failed: The Name in the document type declaration must match the element type of the root element. Example: ]> Hello! Explanation: The documents root element, salutation, does not match the root element declared in the DTD (greeting).
ACTION	Correct the document.