Looks like a simple typo on your part. The third triple pattern should be as follows:
?film_title <http:
Also, the FILTER you use can make the request very slow, try using the following instead:
FILTER(LANGMATCHES(LANG(?film_abstract), "en"))
Although playing with your query, there is no data that actually matches your query in DBPedia. Essentially, the genre property you use seems to apply only to music, not movies, so you should completely remove the third triple picture if you really want to get any results.
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