[1] There is a mismatch in whitespace between source and target content. content or the text violates specific rules related to the use of whitespace.. [2] A source segment starts with six space characters but the corresponding target segment has two non-breaking spaces at the start. The text uses a run of 12 space characters instead of a tab character to align numbers in a table. Two space characters appear after a period even though only a single period should be used. [3] S or T [0] 
whitespace