diff --git a/formats_err/expr_unknown_method1.ksy b/formats_err/expr_unknown_method1.ksy
index 7400a523..08e56493 100644
--- a/formats_err/expr_unknown_method1.ksy
+++ b/formats_err/expr_unknown_method1.ksy
@@ -1,5 +1,5 @@
 # expr_unknown_method1.ksy: /instances/foo/value:
-# 	error: don't know how to call method 'frobnicate' of object type 'CalcBytesType'
+# 	error: don't know how to call method 'frobnicate' of object type 'byte array'
 #
 meta:
   id: expr_unknown_method1
diff --git a/formats_err/expr_unknown_method2.ksy b/formats_err/expr_unknown_method2.ksy
index 73cbba84..09b47228 100644
--- a/formats_err/expr_unknown_method2.ksy
+++ b/formats_err/expr_unknown_method2.ksy
@@ -1,5 +1,5 @@
 # expr_unknown_method2.ksy: /instances/foo/value:
-# 	error: don't know how to call method 'frobnicate' of object type 'CalcBytesType'
+# 	error: don't know how to call method 'frobnicate' of object type 'byte array'
 #
 meta:
   id: expr_unknown_method2
diff --git a/formats_err/io_on_bytes.ksy b/formats_err/io_on_bytes.ksy
index e43a4aaa..2ede78aa 100644
--- a/formats_err/io_on_bytes.ksy
+++ b/formats_err/io_on_bytes.ksy
@@ -1,5 +1,5 @@
 # io_on_bytes.ksy: /instances/one_in_foo/io:
-# 	error: don't know how to call method '_io' of object type 'BytesLimitType(IntNum(100),None,false,None,None)'
+# 	error: don't know how to call method '_io' of object type 'byte array'
 #
 meta:
   id: io_on_bytes