Indusoft Secure Viewer IWS V2020

Dear

A query when using "IWS V2020 Secure Viewer", I did all the configuration as indicated in the manual, but I get the following error:

" ISSymbol coul not be registered. Error 126-The specified module can not be found ".

Could you explain to me if in the 2020 version of "IWS V2020 Secure Viewer" there is any new configuration that I am missing.

Best regards