i found the answer .there was a problem in defining the device "r306":
(? REF=R306.2 Name="RC0402FR-0747K5L VAL==Resistance" L="L18_Bottom Layer")
and i deleted (.2) and it corrected:
(? REF=R306 Name="RC0402FR-0747K5L VAL==Resistance" L="L18_Bottom Layer")