With your help I found the solution. My DB was initially based on a 9.0 server and I had restored it on the 9.1 server. For some reason 9.0 fuzzystrmatch functions (levenstein...) were already present in this DB. So, CREATE EXTENSION fuzzystrmatch did not work. I had to manually remove function 9.0 fuzzystrmatch functions and then CREATE EXTENSION .... worked perfectly and levenstein_less_equal as well. So, it was error from the DB restored from an older version of postgresql.
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