safe_eval:cannot eval fuctions.. warning for RML

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2013-12-09 17:55:04,994 3944 ERROR Test_Dec openerp.tools.safe_eval: Cannot eval "'' ]][[ line_no() ]][[ blank_line(10)]][[ setTag('para','xpre')" -Traceback (most recent call last):
File "C:\Program Files\OpenERP 7.0-20131021-123225\Server\server.\openerp\tools\safe_eval.py", line 241, in safe_eval -File "C:\Program Files\OpenERP 7.0-20131021-123225\Server\server.\openerp\tools\safe_eval.py", line 107, in test_expr -File "<string>", line 1 '' ]][[ line_no() ]][[ blank_line(10)]][[ setTag('para','xpre') ^ -SyntaxError: invalid syntax -2013-12-09 17:55:04,994 3944 WARNING Test_Dec openerp.report.render.rml2pdf.utils: rml_tag: "'' ]][[ line_no() ]][[ blank_line(10)]][[ setTag('para','xpre')" -Traceback (most recent call last):
File "C:\Program Files\OpenERP 7.0-20131021-123225\Server\server.\openerp\report\render\rml2pdf\utils.py", line 84, in _child_get
- File "C:\Program Files\OpenERP 7.0-20131021-123225\Server\server.\openerp\tools\safe_eval.py", line 241, in safe_eval -File "C:\Program Files\OpenERP 7.0-20131021-123225\Server\server.\openerp\tools\safe_eval.py", line 107, in test_expr
- File "<string>", line 1 '' ]][[ line_no() ]][[ blank_line(10)]][[ setTag('para','xpre') ^
- SyntaxError: invalid syntax

can not execute functions from RML file.