[Asterisk-Users] syntax error

[Mimmus]

Does anyone know why this row:

 exten => s,2,GotoIf($[${CALLERIDNAME:0:${LEN(${RGPREFIX})}} !=
${RGPREFIX}]?4:3)

generate this error:

ast_expr2.fl: ast_yyerror(): syntax error: syntax error, unexpected TOK_NE,
expecting TOK_MINUS or TOK_COMPL or TOK_LP or TOKEN; Input:
 != 
 ^

?

I was unable to debug it.
--
DV