diff --git a/slsDetectorSoftware/commonFiles/error_defs.h b/slsDetectorSoftware/commonFiles/error_defs.h
index cf4fcf33a..f8e6147db 100644
--- a/slsDetectorSoftware/commonFiles/error_defs.h
+++ b/slsDetectorSoftware/commonFiles/error_defs.h
@@ -43,6 +43,7 @@ using namespace std;
 #define COULDNOT_STOP_RECEIVER				0x0000000000000080ULL
 #define DETECTOR_TIMER_VALUE_NOT_SET		0x0000000000000100ULL
 #define RECEIVER_ACQ_PERIOD_NOT_SET			0x0000000000000200ULL
+#define RECEIVER_FRAME_NUM_NOT_SET			0x0000000000000400ULL
 
 /** @short class returning all error messages for error mask */
 class errorDefs {
@@ -121,6 +122,8 @@ public:
 		if(slsErrorMask&RECEIVER_ACQ_PERIOD_NOT_SET)
 			retval.append("Could not set acquisition period in receiver.\n");
 
+		if(slsErrorMask&RECEIVER_FRAME_NUM_NOT_SET)
+			retval.append("Could not set frame number in receiver.\n");
 
 		return retval;