From ecc0560ebcfdb7c87518ae25e2744911490b80f8 Mon Sep 17 00:00:00 2001
From: Joel Dudley <joeldudleyr3@users.noreply.github.com>
Date: Fri, 11 May 2018 10:46:46 +0100
Subject: [PATCH] Adds a clear error message from progress tracker requirement
 fails. (#3116)

---
 .../src/main/kotlin/net/corda/core/utilities/ProgressTracker.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/src/main/kotlin/net/corda/core/utilities/ProgressTracker.kt b/core/src/main/kotlin/net/corda/core/utilities/ProgressTracker.kt
index bb58a0d1e3..f37cf3b5de 100644
--- a/core/src/main/kotlin/net/corda/core/utilities/ProgressTracker.kt
+++ b/core/src/main/kotlin/net/corda/core/utilities/ProgressTracker.kt
@@ -118,7 +118,7 @@ class ProgressTracker(vararg steps: Step) {
             if (currentStep == value) return
 
             val index = steps.indexOf(value)
-            require(index != -1)
+            require(index != -1, { "Step ${value.label} not found in progress tracker." })
 
             if (index < stepIndex) {
                 // We are going backwards: unlink and unsubscribe from any child nodes that we're rolling back