Vstgui issue @ void PeakParameter::toString

void PeakParameter::toString (ParamValue normValue, String128 string) const
{
String str;
if (normValue > 0.0001)
{
str.printf (“%.3f”, (float)normValue);
}
else
{
str.assign (“-”);
str.append (kInfiniteSymbol);
}
str.toWideString (kCP_Utf8);
str.copyTo16 (string, 0, 128);
}

I get two errors:

Unknown type name ‘String’
and
Use of undeclared identifier ‘kCP_Utf8’

add
#include “base/source/fstring.h”

Thank you.