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The schematic file is an XML file so you can open it with a text editor and fix at the problem line.
Remember to make a backup of your problem file first so you can recover to the current point should things go wrong.
Have a look at line 157 in the area of column 24
Compare the format of that line with similar lines above and below and you should see the problem with its formatting.
Eagle experiences these bad saves from time to time.
Make the change, save the file and you should be OK.