[Debug unreadable]

Hi evryone , 

I m coding with Cakephp ,  and when i get an error , there is not a debug stack , but something like that unreadable 

" � ��[w�F�(�l���C ';�&"H�w]�-Kr��u�$;{��ŀ@�� 4J� �u^�'���8y�����WՍ�] e�s⬈$�]]]U]]�]]�� �T�� % g��W��R���<�5K�'�bNkR�ޭ)��j�f �^��[�� J �zmW ۮNd�ʮʆ}C��A5gB� �V9��ڈ� 9< �7}��- E�m{�b�շ6��j��?���S!�l�w*Ԩ@�������M � � �, �[+ �3 [S�EdUՌ1��T6� � A�� Y��M2i g��j�d4�5�F�4v\D�A �b8T� <��o{Be5�sJ �( ٲ��S�;�j� z�ؿ�) � a�ȊBm�ȆJ,:5�� x����1�|mj*��� E� �mϩ-��ߑi�scd���� �.��� �8άJ�͵��� W_�V���Lv��N+ �Ρ `}x��-n( ˜� 1� Gst�?�,Ӳ�k�W� C�J �ڊ��P�C���82��NɵFof�� *L� T u� �� o�+ j�FS�ɎJ�5�Vُp�@�+ ��S� Dob��N ��Y���� 6��Ǽ1 #� K ��Bj�0�� � [!8�w* }��`�z��B��ymh���X�L�j� �����jQx �暦����޾�S� �e(�C���[�~c�?^�HB]h-���6� �a����N�� ��� �� / 4 ��| N��N�"����+�# :�06ͱN��f3�G��䩦�� �{j !V V� V� �U ��� � ]�쟐�M ��[�t&(4�$lb[ � � A� sľ M�����o͹E칅 ��k` � d"ۤ�� �2Ww�#Y�i%���Zc�u� 7 � �j�� �f ��W���w� �/���%[ � L � y� 0/�� ���;�f� 1(�w p� �+�pQ�}�?���@�C���̒ � �u�-� ��Ҩ �lsXH5_o�o��q��3 �� �� zB�z���v������D ���T�%� ���W���� ���=� ���ڷ͑��ҩ2�>=�0 ��?������� U �+��԰MkDZ�4�LTݻ(����|-���,� X"

Any one know what's the problem ? ( i tried to set UTF 8 header , nothing .. ) !

Thank you !

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