This client-side error is clear but can be awkward to solve. It means your browser has not been able to load the tapestry.js file properly. The question is, why? It can be due to multiple reasons, some of them below:
If you have set the tapestry.combine-scripts configuration symbol to true, Tapestry generates one single URL to retrieve all the JS files. Sometimes, this can produce long URLs that browsers are unable to retrieve. Try setting the symbol to false.
This only applies to Tapestry 5.1.
T5object and the
Tapestryobject in the browser? (5.3 and earlier)
Both of these objects are namespaces: containers of functions, constants, and nested namespaces.
T5 object is a replacement for the
Tapestry object, starting in release 5.3. Increasingly, functions defined by the
Tapestry object are being replaced with similar or equivalent functions in the
Tapestry object is specifically linked to Prototype and Scriptaculous.
T5 object ensures that your component will be useful regardless of whether the final application is built using Prototype, jQuery or something else.