diff --git a/openpype/hosts/standalonepublisher/plugins/publish/help/validate_editorial_resources.xml b/openpype/hosts/standalonepublisher/plugins/publish/help/validate_editorial_resources.xml
new file mode 100644
index 0000000000..803de6bf11
--- /dev/null
+++ b/openpype/hosts/standalonepublisher/plugins/publish/help/validate_editorial_resources.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<root>
+<error id="main">
+<title>Missing source video file</title>
+<description>
+## No attached video file found
+
+Process expects presence of source video file with same name prefix as an editorial file in same folder.
+(example `simple_editorial_setup_Layer1.edl` expects `simple_editorial_setup.mp4` in same folder)
+
+
+### How to repair?
+
+Copy source video file to the folder next to `.edl` file. (On a disk, do not put it into Standalone Publisher.)
+</description>
+</error>
+</root>
diff --git a/openpype/hosts/standalonepublisher/plugins/publish/validate_editorial_resources.py b/openpype/hosts/standalonepublisher/plugins/publish/validate_editorial_resources.py
index 6759b87ceb..7987bbc2d9 100644
--- a/openpype/hosts/standalonepublisher/plugins/publish/validate_editorial_resources.py
+++ b/openpype/hosts/standalonepublisher/plugins/publish/validate_editorial_resources.py
@@ -1,5 +1,6 @@
 import pyblish.api
 import openpype.api
+from openpype.pipeline import PublishXmlValidationError
 
 
 class ValidateEditorialResources(pyblish.api.InstancePlugin):
@@ -19,5 +20,7 @@ class ValidateEditorialResources(pyblish.api.InstancePlugin):
             f"Instance: {instance}, Families: "
             f"{[instance.data['family']] + instance.data['families']}")
         check_file = instance.data["editorialSourcePath"]
-        msg = f"Missing \"{check_file}\"."
-        assert check_file, msg
+        msg = f"Missing source video file."
+
+        if not check_file:
+            raise PublishXmlValidationError(self, msg)