[Hibernate] problem with hibernate and postgres

Hi! I have a little problem with hibernate(2.0.3) and postgres (7.2) when i use net.sf.hibernate.tool.hbm2ddl.SchemaExport to generate my database i get some errors : v.g. : alter table DOCUMENT drop constraint FK6202C11BED92EF77 Unsuccessful: ERROR: parser: parse error at or near "" alter table

[Hibernate] problem with hibernate and postgres

Hi! I have a little problem with hibernate an postgres. when i use net.sf.hibernate.tool.hbm2dll.SchemaExport to generate my tables I get a lot of parse error from the database : v.g. : alter table DOCUMENT drop constraint FK6202C11BED92EF77 Unsuccessful: ERROR: parser: parse error at or near ""