Each of those messages has:
a file name
a row and column where the error was PERCEIVED
The actual error may have happened earlier, but only till it reached a point where something NEW was to happen that would now be impossible (typ unbalanced tags. you are trying to close more than were open
).
In this case
Look for naked text (tagless) , missing/wrong type quotes, colon vs semicolon.
If you use the calibre editors check tool (the bug icon), double click the error message: it should take you to the line with the error (as noted above)