Kratronic Tools » Problem with setting variable

When this script gets to MessageBox, it displays {{Num2 instead of a number. I do not know what is wrong.

Wenn dieses Skript zu MessageBox kommt, zeigt es {{Num2 anstelle einer Zahl an. Ich weiß nicht was falsch ist

{{Mouse 1, 1, 1133, 177, 0
{{Label Restart
{TAB}
{TAB}
^a
^c
{{SetString1 {{Clipboard}}
{{SetVarNum2 {{Len {{String1}}
{{MessageBox} {{Num2 <----------------------------------- error
{TAB}
{TAB}
{TAB}
{TAB}
{TAB}
{TAB}
{TAB}
{DOWN}

{{Goto Restart

The actual output is "{{Num2" - that is what is displayed in the MessageBox.

Danke!