diff --git a/env/object.go b/env/object.go
index 6e1c2dee..22ad4d60 100644
--- a/env/object.go
+++ b/env/object.go
@@ -1399,6 +1399,10 @@ func (i Error) Inspect(e Idxs) string {
 }
 
 func (i Error) Print(e Idxs) string {
+	return i.Print2(e, 1)
+}
+
+func (i Error) Print2(e Idxs, depth int) string {
 	status := ""
 	if i.Status != 0 {
 		status = "(" + strconv.Itoa(i.Status) + ")"
@@ -1406,7 +1410,11 @@ func (i Error) Print(e Idxs) string {
 	var b strings.Builder
 	b.WriteString("Error" + status + ": " + i.Message + " ")
 	if i.Parent != nil {
-		b.WriteString("\n\t" + i.Parent.Print(e))
+		b.WriteString("\n")
+		for i := 0; i < depth; i++ {
+			b.WriteString("  ")
+		}
+		b.WriteString(i.Parent.Print2(e, depth+1))
 	}
 	for k, v := range i.Values {
 		switch ob := v.(type) {
diff --git a/env/series.go b/env/series.go
index 13693527..67adeb84 100755
--- a/env/series.go
+++ b/env/series.go
@@ -106,7 +106,7 @@ func (ser TSeries) Len() int {
 // PositionAndSurroundingElements returns a string of the position of the series, marked with (here) and 10 surrounding elements.
 func (ser TSeries) PositionAndSurroundingElements(idxs Idxs) string {
 	var bu strings.Builder
-	bu.WriteString("{ ")
+	bu.WriteString("  ")
 	st := 0
 	if ser.Pos() > 10 {
 		bu.WriteString("... ")
@@ -130,6 +130,6 @@ func (ser TSeries) PositionAndSurroundingElements(idxs Idxs) string {
 	if ser.Len() > ser.Pos()+9 {
 		bu.WriteString("... ")
 	}
-	bu.WriteString("}")
+	bu.WriteString("")
 	return bu.String()
 }
diff --git a/evaldo/builtins.go b/evaldo/builtins.go
index 765b167a..4a6d9aa4 100644
--- a/evaldo/builtins.go
+++ b/evaldo/builtins.go
@@ -53,7 +53,7 @@ func MakeArgError(env1 *env.ProgramState, N int, typ []env.Type, fn string) *env
 		}
 		types += env.NativeTypes[tt-1]
 	}
-	return env.NewError("Function " + fn + " requires argument " + strconv.Itoa(N) + " to be of	: " + types + ".")
+	return env.NewError("builtin `" + fn + "` requires argument " + strconv.Itoa(N) + " to be: " + types + ".")
 }
 
 func MakeNativeArgError(env1 *env.ProgramState, N int, knd []string, fn string) *env.Error {
diff --git a/evaldo/evaldo.go b/evaldo/evaldo.go
index dfe33234..ca5077bb 100644
--- a/evaldo/evaldo.go
+++ b/evaldo/evaldo.go
@@ -2,6 +2,7 @@ package evaldo
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/refaktor/rye/env"
 	//"fmt"
@@ -207,6 +208,10 @@ func EvalExpressionInjLimited(ps *env.ProgramState, inj env.Object, injnow bool)
 		if ps.ReturnFlag {
 			return ps, injnow
 		}
+		fmt.Println("XY")
+		if esleft.Res.Type() == env.ErrorType {
+			fmt.Println("XX")
+		}
 	} else {
 		// otherwise set program state to specific one and injected value to result
 		// set injnow to false and if return flag return
@@ -392,7 +397,7 @@ func EvalExpressionConcrete(ps *env.ProgramState) *env.ProgramState {
 		}
 	} else {
 		ps.ErrorFlag = true
-		ps.Res = env.NewError("expected rye value but got nothing")
+		ps.Res = env.NewError("expected rye value but it's missing")
 	}
 
 	return ps
@@ -924,6 +929,7 @@ func CallBuiltin(bi env.Builtin, ps *env.ProgramState, arg0_ env.Object, toLeft
 			return ps
 		}
 		if checkErrorReturnFlag(ps) {
+			ps.Res = env.NewError4(0, "argument 1 of "+strconv.Itoa(bi.Argsn+1)+" missing of builtin: '"+bi.Doc+"'", ps.Res.(*env.Error), nil)
 			return ps
 		}
 		if ps.Res.Type() == env.VoidType {
@@ -942,6 +948,7 @@ func CallBuiltin(bi env.Builtin, ps *env.ProgramState, arg0_ env.Object, toLeft
 			return ps
 		}
 		if checkErrorReturnFlag(ps) {
+			ps.Res = env.NewError4(0, "argument 2 of "+strconv.Itoa(bi.Argsn+1)+" missing of builtin: '"+bi.Doc+"'", ps.Res.(*env.Error), nil)
 			return ps
 		}
 		//fmt.Println(ps.Res)
@@ -958,6 +965,7 @@ func CallBuiltin(bi env.Builtin, ps *env.ProgramState, arg0_ env.Object, toLeft
 			return ps
 		}
 		if checkErrorReturnFlag(ps) {
+			ps.Res = env.NewError4(0, "argument 3 missing", ps.Res.(*env.Error), nil)
 			return ps
 		}
 		if ps.Res.Type() == env.VoidType {
@@ -1103,7 +1111,7 @@ func checkFlagsBi(bi env.Builtin, ps *env.ProgramState, n int) bool {
 		if bi.AcceptFailure {
 			trace2("----- > Accept Failure")
 		} else {
-			fmt.Println("checkFlagsBi***")
+			// fmt.Println("checkFlagsBi***")
 			trace2("Fail ------->  Error.")
 			switch err := ps.Res.(type) {
 			case env.Error:
diff --git a/main_wasm.go b/main_wasm.go
index 207a4844..fd9b0016 100755
--- a/main_wasm.go
+++ b/main_wasm.go
@@ -62,6 +62,9 @@ var (
 func sendMessageToJS(message string) {
 	jsCallback.Invoke(message)
 }
+func sendMessageToJSNL(message string) {
+	jsCallback.Invoke(message + "\n")
+}
 
 func sendLineToJS(line string) string {
 	ret := jsCallback2.Invoke(line)
@@ -179,7 +182,7 @@ func RyeEvalShellLine(this js.Value, args []js.Value) any {
 		}
 
 		evaldo.EvalBlockInj(ps, prevResult, true)
-		evaldo.MaybeDisplayFailureOrErrorWASM(ps, ps.Idx, sendMessageToJS)
+		evaldo.MaybeDisplayFailureOrErrorWASM(ps, ps.Idx, sendMessageToJSNL)
 
 		prevResult = ps.Res