line 1: unmatched </P> (no matching <P> seen)
Because your HTML format tags need to be in pairs. A 'begin format' tag and an 'end format' tag. The 'end format' tag has a slash / in it. The error is telling you that you have an 'end format' tag </p> but you don't have a 'begin format <p> tag.
Either get rid of the </p> or add a <p>
Following syntax is very annoying sometimes. Count all <P> Vs. </P>, you will definitely found a difference. I hope of only of one.
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