Oracle Text/PL SQL errors

Question

Is anyone familiar with this error. I have removed all the problem characters and words that may cause problems so it is not that.
[1]: (Error): ORA-20000: Oracle Text error: DRG-50901: text query parser syntax error on line 1, column 1 ORA-06512: at line 3
BEGIN
for rec in (select COMMENTS,FAILURE_REASON from COMMENTS7105) loop
update COMMENTS7105
set "CATEGORY" = CASE
when rec.FAILURE_REASON not in (select distinct tmocategory from categories)
then (select "CATEGORY" from (select "CATEGORY",SCORE(1) SCORE from CATEGORIES where contains(SUBCATEGORY, '
<query>
<textquery lang = "ENGLISH" grammar = "CONTEXT">'||rec.comments||'
<progression>
<seq><rewrite>transform((TOKENS, "{", "}", " "))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "AND"))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "NEAR"))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "ACCUM"))</rewrite></seq>
</progression>
</textquery>
<score datatype = "INTEGER" algorithm = "COUNT" />
</query>', 1) <> 0
and SCORE(1) > 1
order by SCORE(1) desc)
where rownum = 1)
when rec.FAILURE_REASON in (select distinct tmocategory from categories)
then (select "CATEGORY" from (select "CATEGORY",SCORE(1) SCORE from CATEGORIES where contains(SUBCATEGORY, '
<query>
<textquery lang = "ENGLISH" grammar = "CONTEXT">'||rec.comments||'
<progression>
<seq><rewrite>transform((TOKENS, "{", "}", " "))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "AND"))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "NEAR"))</rewrite></seq>
<seq><rewrite>transform((TOKENS, "{", "}", "ACCUM"))</rewrite></seq>
</progression>
</textquery>
<score datatype = "INTEGER" algorithm = "COUNT" />
</query>', 1) <> 0
and SCORE(1) > 1
and TMOCATEGORY = rec.FAILURE_REASON
order by SCORE(1) desc)
where rownum = 1)
else 'Unknown' end
where COMMENTS LIKE '%'||rec.COMMENTS||'%';
end loop;
END;
Can someone please help me. Any help is greatly appreciated.

Answer 1

Duplicate post answered on Text forum:
Categorizing Data with Oracle Text