diff --git a/DesignerSpace/Workspace/FunctionLibraries/SessionFunctions.js b/DesignerSpace/Workspace/FunctionLibraries/SessionFunctions.js
index ce13dc6bf..453fe61e7 100644
--- a/DesignerSpace/Workspace/FunctionLibraries/SessionFunctions.js
+++ b/DesignerSpace/Workspace/FunctionLibraries/SessionFunctions.js
@@ -9,16 +9,19 @@ function newSessionFunctions () {
   function runSession (node, functionLibraryProtocolNode, callBackFunction) {
     /* We can not run a sessionif its parent process is not running. Less if it does not have a parent. */
     if (node.payload.parentNode === undefined) {
+      node.payload.uiObject.setErrorMessage('Session needs a Process Instance parent to be able to run.')
       callBackFunction(GLOBAL.DEFAULT_FAIL_RESPONSE)
       return
     }
 
     if (node.payload.parentNode.payload.uiObject.isRunning !== true) {
+      node.payload.uiObject.setErrorMessage('Session needs a Process Instance parent to be running to be able to run.')
       callBackFunction(GLOBAL.DEFAULT_FAIL_RESPONSE)
       return
     }
 
     if (node.payload.referenceParent === undefined) {
+      node.payload.uiObject.setErrorMessage('Parent Process Instance need to reference a Process Definition.')
       callBackFunction(GLOBAL.DEFAULT_FAIL_RESPONSE)
       return
     }