Error when installing Exchange 2013 (in an existing Exchange 2010 environment)

During the setup of the mailbox role, the Exchange 2013 installation wizard returned the following error and halted...

[07/30/2015 16:32:29.0946] [1] The following error was generated when "$error.Clear();
          if (!$RoleIsDatacenter -and !$RoleIsDatacenterDedicated)
          {
            $createNewOab = $false;
            $oabName = $null;
            $oabAddressList = $null;
            $oabVdirs = $null;
            $oabGlobalWebDistribution = $false;
            $oabConfiguredAttributes = $null;

            Write-ExchangeSetupLog -Info ("Looking for an existing default OAB");
            $defaultOab = Get-OfflineAddressBook -DomainController:$RoleDomainController | where {$_.IsDefault};
            if ($defaultOab -ne $null)
            {
              Write-ExchangeSetupLog -Info ("Found a default OAB: " + $defaultOab.Name + "; checking its version");
              if ($defaultOab.ExchangeVersion.CompareTo([Microsoft.Exchange.Data.ExchangeObjectVersion]::Exchange2012) -lt 0)
              {
                $e15Oab = Get-OfflineAddressBook -DomainController:$RoleDomainController | where {$_.ExchangeVersion.CompareTo([Microsoft.Exchange.Data.ExchangeObjectVersion]::Exchange2012) -eq 0};
                if ($e15Oab -eq $null)
                {
                  Write-ExchangeSetupLog -Info ("Existing OAB is Exchange 2010 or older; will create a new OAB");
                  $createNewOab = $true;
                  $oabName = $defaultOab.Name + " (Ex2013)";
                  $oabAddressList = $defaultOab.AddressLists;
                  $oabGlobalWebDistribution = $defaultOab.GlobalWebDistributionEnabled;
                  $oabConfiguredAttributes = $defaultOab.ConfiguredAttributes;
                }
                else
                {
                  Write-ExchangeSetupLog -Info ("Already has an existing Exchange 2013 OAB:" + $e15Oab.Name + "; will not create a new OAB");
                }
              }
              else
              {
                Write-ExchangeSetupLog -Info ("Existing OAB is Exchange 2013 or newer; will not create a new OAB");
              }
            }
            else
            {
              Write-ExchangeSetupLog -Info ("Did not find a default OAB; will create one");
              $createNewOab = $true;
             
              $oabName = [Microsoft.Exchange.Data.Directory.SystemConfiguration.OfflineAddressBook]::DefaultName;
              $nonDefaultOabWithDefaultName = Get-OfflineAddressBook $oabName -DomainController:$RoleDomainController -ErrorAction SilentlyContinue | where {$_.IsDefault -eq $false};
              if ($nonDefaultOabWithDefaultName -ne $null)
              {
                $createNewOab = $false;
                Write-ExchangeSetupLog -Warning `
                  ("Offline address book " + `
                  $nonDefaultOabWithDefaultName.Name + `
                  " already exists: " + `
                  $nonDefaultOabWithDefaultName.DistinguishedName + `
                  ". Use administrative tools to change it to default OAB.");
              }

              $allGals = @(Get-GlobalAddressList -DomainController:$RoleDomainController | where {$_.IsDefaultGlobalAddressList});
              if ($allGals -eq $null -or $allGals.Count -eq 0)
              {
                $createNewOab = $false;
                Write-ExchangeSetupLog -Warning `
                  ("Couldn't find the default global address list. The default offline address book can't be created.");
              }
              elseif ($allGals.Count -gt 1)
              {
                $createNewOab = $false;
                Write-ExchangeSetupLog -Warning `
                  ("Found " + $allGals.Count + " default global address lists. You can have only one default global address list in your organization. The default offline address book will not be created.");

We do have two global address lists.  One is named Default Global Address List and the other is Company Name Addresses.

I am not able to browse/edit our public folders using the Public Folder Management Console for some reason.  It indicates it is not connected to a server, and I cannot manually connect to either of our two Exch 2010 HT/CAS/MB servers.