1. With IE it gives that kind of issue sometimes, Please use latest Mozilla.
First try with step 1 only.
2. if in Mozilla also it gives the same message - then you need some entries in instanceconfig.xml.
Under Marketing element add this
Please revert back which one has solved your issue and points please.
First of all, thanks for your solution idea. Because of our company rules, i cant used Mozilla, so i didnt try step 1...
With the second solution step, after changed config file like above, still it was getting same error in IE .
I think, i need a compatible solution method with IE.