diff --git a/mk2rbc/mk2rbc_test.go b/mk2rbc/mk2rbc_test.go
index 1e53c30..2d768ae 100644
--- a/mk2rbc/mk2rbc_test.go
+++ b/mk2rbc/mk2rbc_test.go
@@ -1049,7 +1049,7 @@
   }.get("vendor/%s/cfg.mk" % g["MY_PATH"])
   (_varmod, _varmod_init) = _entry if _entry else (None, None)
   if not _varmod_init:
-    rblf.mkerror("cannot")
+    rblf.mkerror("product.mk", "Cannot find %s" % ("vendor/%s/cfg.mk" % g["MY_PATH"]))
   rblf.inherit(handle, _varmod, _varmod_init)
 `,
 	},
@@ -1073,7 +1073,7 @@
   }.get("%s/cfg.mk" % g["MY_PATH"])
   (_varmod, _varmod_init) = _entry if _entry else (None, None)
   if not _varmod_init:
-    rblf.mkerror("cannot")
+    rblf.mkerror("product.mk", "Cannot find %s" % ("%s/cfg.mk" % g["MY_PATH"]))
   rblf.inherit(handle, _varmod, _varmod_init)
 `,
 	},
@@ -1099,7 +1099,7 @@
   }.get("%s/cfg.mk" % g["MY_PATH"])
   (_varmod, _varmod_init) = _entry if _entry else (None, None)
   if not _varmod_init:
-    rblf.mkerror("cannot")
+    rblf.mkerror("product.mk", "Cannot find %s" % ("%s/cfg.mk" % g["MY_PATH"]))
   rblf.inherit(handle, _varmod, _varmod_init)
   #RBC# include_top vendor/foo1
   _entry = {
@@ -1107,7 +1107,7 @@
   }.get("%s/cfg.mk" % g["MY_PATH"])
   (_varmod, _varmod_init) = _entry if _entry else (None, None)
   if not _varmod_init:
-    rblf.mkerror("cannot")
+    rblf.mkerror("product.mk", "Cannot find %s" % ("%s/cfg.mk" % g["MY_PATH"]))
   rblf.inherit(handle, _varmod, _varmod_init)
 `,
 	},