diff --git a/src/component/app/App.tsx b/src/component/app/App.tsx
index 9a099f4..d53ca4e 100644
--- a/src/component/app/App.tsx
+++ b/src/component/app/App.tsx
@@ -1,17 +1,15 @@
 import { useEffect, useMemo, useState } from 'react';
-import { extendedEnv } from './environment';
 import { GlobalContext } from '../../context/GlobalContext';
+import { deepEvalExpr } from '../../eval/deep_eval';
 import { inferType, scoreTypeInfo } from '../../eval/infer_type';
 import { ExprBlock, type ExprBlockState } from '../expr/ExprBlock';
+import { TypeInfoBlock } from '../other/Type';
+import { Value } from '../other/Value';
 import { actionShortcuts } from './actions';
 import { biggerExample, emptySet, factorial, higherOrder, higherOrder2Params, inc, initialEditorState, lambda2Params, nonEmptyEditorState, pushBool, setOfListOfBool, tripleFunctionCallEditorState } from "./configurations";
+import { extendedEnv } from './environment';
 
 import './App.css';
-import { evalExpr } from '../../eval/eval';
-import { Value } from '../other/Value';
-import { Type, TypeInfoBlock } from '../other/Type';
-import { deepEvalExpr } from '../../eval/deep_eval';
-
 
 const examples: [string, ExprBlockState][] = [
   ["empty editor"        , initialEditorState           ],
@@ -140,10 +138,11 @@ export function App() {
 
   // static evalution
   const typeInfo = useMemo(() => inferType(currentState, extendedEnv), [currentState]);
-  // dynamic evalutions
-  const evalResult = evalExpr(currentState, extendedEnv);
+
+  // dynamic evalution
   const deepEvalResult = deepEvalExpr(currentState, extendedEnv);
-  console.log({deepEvalResult});
+
+  const err = typeInfo.err || deepEvalResult.err;
 
   const onCopy = () => {
     const serialized = JSON.stringify(currentState);
@@ -216,7 +215,7 @@ export function App() {
           />
           =
           <Value dynamic={{
-            i: evalResult.val,
+            i: err ? undefined : deepEvalResult.val,
             t: typeInfo.type,
           }}/>
           ::
diff --git a/src/component/expr/CallBlock.tsx b/src/component/expr/CallBlock.tsx
index 7ce443b..462d1e0 100644
--- a/src/component/expr/CallBlock.tsx
+++ b/src/component/expr/CallBlock.tsx
@@ -41,6 +41,7 @@ function nestedInputProperties({state, setState, score, typeInfo, evalResult}: C
     setState(state => ({...state, input: callback(state.input)}));
   };
   const onInputCancel = () => {
+    
     setState(state => /*addFocusRightMost*/(state.fn)); // we become our function
   };
   const scoreInput = (inputSuggestion: ExprBlockState) => {
@@ -52,7 +53,9 @@ function nestedInputProperties({state, setState, score, typeInfo, evalResult}: C
 export function CallBlock(props: CallBlockProps) {
   const globalContext = useContext(GlobalContext);
   const addParam = getActions(globalContext, props.setState).c;
-  return <span className={"functionBlock"}>
+  const err = props.typeInfo.err || props.evalResult.err;
+
+  return <span className="functionBlock dropdownContainer">
     <CallContext value={{addParam}}>
       <FunctionHeader {...props} addParam={addParam} />
       <div className="functionParams">
@@ -66,6 +69,12 @@ export function CallBlock(props: CallBlockProps) {
         </div>
       </div>
     </CallContext>
+    {(err !== undefined) &&
+      <span className="">
+        <div className="errorMessage">
+          {err.message.trim()}
+        </div>
+      </span>}
   </span>;
 }
 
diff --git a/src/component/expr/ExprBlock.css b/src/component/expr/ExprBlock.css
index 750df93..07aa347 100644
--- a/src/component/expr/ExprBlock.css
+++ b/src/component/expr/ExprBlock.css
@@ -14,7 +14,7 @@
 .errorMessage {
   color: darkred;
   background-color: pink;
-  margin-top: 4px;
+  /* margin-top: 4px; */
   z-index: 10;
   font-family: var(--my-monospace-font);
   white-space-collapse: preserve;
diff --git a/src/component/expr/InputBlock.tsx b/src/component/expr/InputBlock.tsx
index 7fcad90..f3ac3dd 100644
--- a/src/component/expr/InputBlock.tsx
+++ b/src/component/expr/InputBlock.tsx
@@ -84,7 +84,7 @@ const computeSuggestions = (
   return result;
 }
 
-export function InputBlock({ state, setState, score, onCancel, typeInfo }: InputBlockProps) {
+export function InputBlock({ state, setState, score, onCancel, typeInfo, evalResult }: InputBlockProps) {
   const {text, focus} = state;
   const globalContext = useContext(GlobalContext);
   const env = typeInfo.env;
@@ -144,7 +144,7 @@ export function InputBlock({ state, setState, score, onCancel, typeInfo }: Input
     },
   };
 
-  const err = typeInfo.err || evalExpr(state, env).err;
+  const err = typeInfo.err || evalResult.err;
 
   return <>
     <Input
diff --git a/src/component/other/Input.tsx b/src/component/other/Input.tsx
index 0e4351e..9e440f2 100644
--- a/src/component/other/Input.tsx
+++ b/src/component/other/Input.tsx
@@ -1,6 +1,7 @@
 import { useEffect, useRef, type ReactNode, type KeyboardEvent, useState } from "react";
 
 import "./Input.css";
+import { focusPrevElement, focusNextElement, setRightMostCaretPosition } from "../../util/dom_trickery";
 
 interface InputProps {
   placeholder: string;
@@ -25,38 +26,6 @@ function getCaretPosition(ref: React.RefObject<HTMLInputElement| null>): number
   return ref.current?.selectionStart || 0;
 }
 
-// Move caret all the way to the right in the currently focused element
-function setRightMostCaretPosition(elem) {
-  const range = document.createRange();
-  range.selectNode(elem);
-  if (elem.lastChild) { // if no text is entered, there is no lastChild
-    range.setStart(elem.lastChild, elem.textContent.length);
-    range.setEnd(elem.lastChild, elem.textContent.length);
-    const selection = window.getSelection();
-    selection?.removeAllRanges();
-    selection?.addRange(range);
-  }
-}
-
-function focusNextElement() {
-  const editable = Array.from<any>(document.querySelectorAll('input.editable'));
-  const index = editable.indexOf(document.activeElement);
-  const nextElem = editable[index+1];
-  if (nextElem) {
-    nextElem.focus();
-  }
-}
-
-function focusPrevElement() {
-  const editable = Array.from<any>(document.querySelectorAll('input.editable'));
-  const index = editable.indexOf(document.activeElement);
-  const prevElem = editable[index-1]
-  if (prevElem) {
-    prevElem.focus();
-    setRightMostCaretPosition(prevElem);
-  }
-}
-
 export function Input({placeholder, text, suggestion, onTextChange, onEnter, onCancel, extraHandlers, children}: InputProps) {
   const ref = useRef<HTMLInputElement>(null);
   const [focus, setFocus] = useState<"yes"|"hide"|"no">("no");