Where I have to put the Verbose property? I found it only in <Log> tag Level property value  in the documentation. But I did not specify any Log tags in my XData. If you mean pLogLevel parameter in the setup method, it is already = 3.

My setup method: 

ClassMethod setup(ByRef pVars, pLogLevel As %Integer = 3, pInstaller As %Installer.Installer, pLogger As %Installer.AbstractLogger) As %Status [ CodeMode = objectgenerator, Internal ]
{
   #; Let XGL document generate code for this method.
   Quit ##class(%Installer.Manifest).%Generate(%compiledclass,
      %code, "MyInstall")
}

My IRIS version is 2020.1. 

I will be grateful if you see any significant differences between my example and yours that cause this error. My Persistent class (this class created using 'CREATE TABLE'):

 // 
Class Fixxer.DEcars Extends %Persistent [ ClassType = persistent, DdlAllowed, Final, Owner = {yploskyi}, ProcedureBlock, SqlRowIdPrivate, SqlTableName = DEcars ]
{ 
Property UniqueIdentifier As %Library.String(MAXLEN = 30) [ SqlColumnNumber = 2 ]; 
Property brand As %Library.String(MAXLEN = 500) [ SqlColumnNumber = 3 ];
Property maxspeed As %Library.String(MAXLEN = 500) [ SqlColumnNumber = 4 ]; 
Property color As %Library.String(MAXLEN = 500) [ SqlColumnNumber = 5 ]; 
Parameter USEEXTENTSET = 1; 
/// Bitmap Extent Index auto-generated by DDL CREATE TABLE statement. Do not edit the SqlName of this index.
Index DDLBEIndex [ Extent, SqlName = "%%DDLBEIndex", Type = bitmap ];
}