Unrecognised mathop in calculation rule found

[bsntech]

VirtueMart version 3.0.2 running on Joomla 3.3.6.

Error message shows as:

vmError: Unrecognised mathop in calculation rule found, seems you created this rule with plugin not longer accesible (deactivated, uninstalled?)

It is being caused by the tax calculation rule.  I have setup rules exactly the same on many different websites - first time I am having a problem with this.

Settings for the tax calculation rule have been set as follows:

Calculation Rule Name = IN Sales Tax
Description = Indiana Sales Tax
Type of Arithmetic Operation = Tax Per Bill
Math Operation = +%
Value = 7.0000
Currency = United States Dollar
Product Category = Available for all
Shopper Groups = Available for all
Country = United States
States = Indiana
Manufacturer = Available for all
Start Date = 01/28/15
End Date = Never

I've re-saved, deleted, re-created, still has the problem.

I also tried to set "Type of Arithmetic Operation" to "Tax per Product" and it never shows up in the cart.

[bsntech]

Just updated to VirtueMart 3.0.4 and it seems this problem has been fixed.