Automation Error with conditional compilation

In Automation mode Excel does not load add-ins by default. Excel loads add-ins using the conditions add-ins were compiled with. In order for Add-In works during Automation mode, one should force Excel to load it prior to load any workbooks depending on that add-in. Below I provide the code example from my real project (with some editions) which implements this loading sequence in JScript. Comments explain steps.

function run_excel() {  dbg_log("run_excel");  g_xla_addin = null;  g_xla = null;  try {    g_add_ins = get_excel_app().AddIns;    dbg_log("finding add_in.xlam");    //Searching for the installed add-in like Application.COMAddIns("WMExcelAddin1")    g_xla_addin = find_addin(g_add_ins, "add_in.xlam");  } catch(v_err) {      throw new error(        "xla_loading"      , CR_xla_loading      , 'Unexpected error occurred while determining if add_in.xlam is installed.'      , v_err      );  }  if (g_xla_addin == null) throw new error(      "xla_loading"    , CR_xla_not_installed    , "MS Excel addin is not installed."    );  try {    dbg_log("opening add_in.xlam");    //In the example, the add-in has the name of its workbook    try { g_xla = g_excel.Workbooks(g_xla_addin.Name); } catch(e) {}    if (g_xla == null) {      g_excel.AutomationSecurity = 1; // 1 == msoAutomationSecurityLow      //Loading the add-in. The add-in also handles `OpenWorkbook` at this time.      g_xla = g_excel.Workbooks.Open(        g_xla_addin.FullName  //FileName      , 2     //UpdateLinks      , true  //ReadOnly      , null  //Format      , null  //Password      , null  //WriteResPassword      , true  //IgnoreReadOnlyRecommended: not display the read-only recommended message      , 2     //Origin: xlWindows      , null  //Delimiter      , null  //Editable      , null  //Notify      , null  //Converter      , false //AddToMru: don't add this workbook to the list of recently used files      , true  //Local: saves files against the language of Microsoft Excel.       , 0     //CorruptLoad: xlNormalLoad       );      hide_excel(); //To speed up and not interfere with user actions    }  } catch(v_err) {    throw new error(      "xla_loading"    , CR_xla_loading    , 'Unexpected error occurred while loading add_in.xlam:\n'    , v_err    );  }  //Now the Add-In is loaded, so the VBA engine knows its API, and the workbook referencing to it are loaded fine.  try {    g_sig_cat_wbk = g_excel.Workbooks.Open(      g_sig_cat_fn  //FileName    , 2     //UpdateLinks    , true  //ReadOnly    , null  //Format    , null  //Password    , null  //WriteResPassword    , true  //IgnoreReadOnlyRecommended: not display the read-only recommended message    , 2     //Origin: xlWindows    , null  //Delimiter    , null  //Editable    , null  //Notify    , null  //Converter    , false //AddToMru: don't add this workbook to the list of recently used files    , false //Local: saves files against the language of Microsoft Excel.     , 0     //CorruptLoad: xlNormalLoad     );//Calling on the loaded workbook the target macro from the loaded add_in.xlam     vba_ret(g_excel.Run(g_xla_addin.Name+"!my_addin.prepare_sig_import", g_sig_cat_wbk.Name));  } catch(v_err) {      throw new error(        "sig_cat_loading"      , CR_sig_cat_loading      , 'Error occured while loading catalog of signals:\n'      , v_err      );  }  finally {    g_sig_cat_wbk.Close(false);    g_sig_cat_wbk = null;  }  dbg_log("run_excel done");}