Error message:
(33205) The <0} mark for ending a translation unit is missing or damaged

Comment: Each translation Unit has 3 marks:
Initial: {0>
Middle (which separates source segment from the target segment): <}100{> End of unit: <0}

Solution: make sure the 3 marks are present in the document. If any of them is missing you can copy it from a previous segment and paste it manually.