Entity: line 1: parser error : internal error: xmlParseInternalSubset: error detected in Markup declaration

 %SYSTEM; 
         ^
Entity: line 1: 
A<lbbbbbbbbbbbbbbbbbbb_
^
Entity: line 1: parser error : DOCTYPE improperly terminated
 %SYSTEM; 
         ^
Entity: line 1: 
A<lbbbbbbbbbbbbbbbbbbb_
^
Entity: line 1: parser error : Start tag expected, '<' not found
 %SYSTEM; 
         ^
Entity: line 1: 
A<lbbbbbbbbbbbbbbbbbbb_
^