diff --git a/WebApp.st b/WebApp.st
index 95eeb0f..0e0bb34 100644
--- a/WebApp.st
+++ b/WebApp.st
@@ -77,7 +77,38 @@ Iliad.ILWidget subclass: PhoneConfigWidget [
     ]
 ]
 
-Iliad.ILWidget subclass: LUWidget [
+Iliad.ILWidget subclass: ErrorWidget [
+    | reason |
+
+    ErrorWidget class >> initWith: anError [
+        ^ self new
+            reason: anError;
+            yourself
+    ]
+
+    reason: aReason [
+        reason := aReason.
+    ]
+
+    contents [
+        ^ [:e | e text: reason ]
+    ]
+]
+
+Iliad.ILWidget subclass: ProcedureWidget [
+    runProcedure: aBlock name: aName[
+        | proc |
+        [
+            proc := aBlock value.
+            proc run.
+            self session procedures add: proc.
+        ] on: Exception do: [:e |
+            self lightbox: (ErrorWidget initWith: aName, ' could not be started.')
+        ]
+    ]
+]
+
+ProcedureWidget subclass: LUWidget [
     contents [
         ^ [:e |
             e a
@@ -87,14 +118,11 @@ Iliad.ILWidget subclass: LUWidget [
     ]
 
     doLU [
-        | lu |
-        lu := self application gsmServer doLU: self session gsmConfig.
-        lu run.
-        self session procedures add: lu.
+        self runProcedure: [self application gsmServer doLU: self session gsmConfig] name: 'LU'
     ]
 ]
 
-Iliad.ILWidget subclass: CallWidget [
+ProcedureWidget subclass: CallWidget [
     contents [
         ^[:e |
             e form build: [:form |
@@ -104,10 +132,7 @@ Iliad.ILWidget subclass: CallWidget [
     ]
 
     placeCall: aNumber [
-        | call |
-        call := self application gsmServer doCallNumber: self session gsmConfig.
-        call run.
-        self session procedures add: call.
+        self runProcedure: [self application gsmServer doCallNumber: self session gsmConfig] name: 'Call'
     ]
 ]