An error occurred when parsing the incoming document

We meet like this error when was connected other system.

Reason: An error occurred when parsing the incoming document: "'.', hexadecimal value 0x00, is an invalid character. Line 1, position 76531."

This error is include unicode in xml data. we must removed unicode.

XML standard characters. look at refrenece.
http://www.w3.org/TR/2004/REC-xml11-20040204/#charsets

Character Range
[2] Char ::= [#x1-#xD7FF] [#xE000-#xFFFD] [#x10000-#x10FFFF]
/* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
[2a] RestrictedChar ::= [#x1-#x8] [#xB-#xC] [#xE-#x1F] [#x7F-#x84] [#x86-#x9F]

thanks.