function length(numeric) does not exist

Version: PostgreSQL 9.2.6, compiled by Visual C++ build 1600, 32-bit

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When I try to use the function length occurs the error:

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"ERRO: 42883: fun=E7=E3o length(numeric) n=E3o existe" (function =
length(numeric)
does not exist).

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Then I try to create length function:

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CREATE OR REPLACE FUNCTION length(tsvector)

  RETURNS int4 AS

'$libdir/tsearch2', 'tsvector_length'

  LANGUAGE 'c' IMMUTABLE STRICT;

ALTER FUNCTION length(tsvector) OWNER TO postgres;

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But the return is:

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-------------------------------------------------------------------------=
---
-------------------------------------------------------------------------=
---
--------

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ERRO:  n=E3o p=F4de encontrar fun=E7=E3o "tsvector_length" no arquivo =
"C:/Program
Files/PostgreSQL/9.2/lib/tsearch2.dll"

(could not find function "tsvector_length" in the file "C:/Program
Files/PostgreSQL/9.2/lib/tsearch2.dll")

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********** Error **********

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ERRO: n=E3o p=F4de encontrar fun=E7=E3o "tsvector_length" no arquivo =
"C:/Program
Files/PostgreSQL/9.2/lib/tsearch2.dll"

(could not find function "tsvector_length" in the file "C:/Program
Files/PostgreSQL/9.2/lib/tsearch2.dll")

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SQL state: 42883

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-------------------------------------------------------------------------=
---
-------------------------------------------------------------------------=
---
--------

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I need the help!

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Thanks!

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