diff --git a/LSL2/STPROC/SIGNATURE_SERVICES.txt b/LSL2/STPROC/SIGNATURE_SERVICES.txt
index 9598e29..40a316f 100644
--- a/LSL2/STPROC/SIGNATURE_SERVICES.txt
+++ b/LSL2/STPROC/SIGNATURE_SERVICES.txt
@@ -224,6 +224,8 @@ end service
 
 
 Service CheckSigOrder(WOMatKey, CurrStage, UseCaching, RDSNo)
+	
+	ErrorMsg = ''
     StartTick = GetTickCount()
     MetricName = 'CheckSigOrder'
     
@@ -2925,3 +2927,4 @@ return
 
 
 
+