ORA-00911: invalid character xsql error - sql

Question

I m using sql query in the xsql file but I have ORA-00911: invalid character error. Same query is working directly on the database.
My index.xsql:
<?xml version="1.0" encoding="ISO-8859-2" ?>
<page connection="labor" xmlns:xsql="urn:oracle-xsql">
<xsql:query>
SELECT id, iata_dep, iata_arr FROM route JOIN flight ON route.route_id=flight.route_id
</xsql:query>
</page>
My browser result:
<?xml version="1.0" encoding="ISO-8859-2" ?>
<page connection="labor" xmlns:xsql="urn:oracle-xsql">
<xsql:query>
SELECT id, iata_dep, iata_arr FROM route JOIN flight ON route.route_id=flight.route_id
</xsql:query>
</page>
Where is the character problem?
Thanks,

Answer 1

There are several problems that can cause such behavior :
This error occurs when you try to use a special character in a SQL
statement. If a special character other than $, _, and # is used in
the name of a column or table, the name must be enclosed in double
quotations.
This error may occur if you've pasted your SQL into your editor from
another program. Sometimes there are non-printable characters that may
be present. In this case, you should try retyping your SQL statement
and then re-execute it.
This error occurs when a special character is used in a SQL WHERE
clause and the value is not enclosed in single quotations.