In particular:

<Key ID="STR_EVAL_ASSERTATION_FAILED">
<Original>Assertation failed</Original>
</Key>

This ^^^^ is called when assert command receives false

assert (false)

<Key ID="STR_EVAL_SCOPE_NAME_DEFINED_TWICE">
<Original>Scope name defined twice</Original>
</Key>

This is ^^^^ called when 2 scopeName commands executed in the same scope

scopeName "scope1";
scopename "scope2";

If these strings are not defined the error message shows "Error" without explanation

Expected:

Error Assertation failed
Error Scope name defined twice

just like when you divide by zero

Error Zero divisor