Cannot run any example code

Getting the same errors every time

vivagraph.js:1 Uncaught SyntaxError: Unexpected token <
index_twit_viva.html:8 Uncaught ReferenceError: Viva is not defined

Start by reproducing the errors shown for vivagraph.js and index_twit_viva.html in the example environment, then inspect how the script is loaded before the Viva reference is used. Done means the example code runs without the reported SyntaxError or ReferenceError.

Written by the indexing model from the issue text.