I get this Error?!

Fatal error: Call to undefined method CurrencyDisplay::getInstance() in …
com_vminvoice/helpers/invoicehtml.php on line 46

Version: 1.3.0
VirtueMart 1.1.6 stable
Joomla! 1.5.22 Stable

I need urgently a solution - thanks

Hello,
first of all, make sure to upgrade to the latest VM Invoice version please, which is now 1.3.4.

Fatal error: Call to undefined method CurrencyDisplay::getInstance() in /is/htdocs/
administrator/components/com_vminvoice/helpers/invoicehtml.php on line 47

Updated to 1.3.4, cleared cache

Has not helped much - now is the error from line 46 on line 47 jumped.
I need urgently a solution - please

Ok, could you please tell, when exactly this happens?
How to replicate this?

After the order button press comes the error message

But the bill in VMInvoice is created and sent.

If I then go into the admin in VM-invoice and open the configuration and click "save"
the message go away after Reload in the Browser

The message will appear between "order" and "confirmation"

Is anyone here?
I have purchased a product that does not work.
And here I get no help - it is very annoying