excanvas throws me errors in IE

I am using excanvas.js that is used with flot jquery graphs. When in FF or chrome the graphs show great. on IE I get this error:

Unknown runtime error excanvas.min.js, line 144 character 21

 el.getContext = getContext;

                // Remove fallback content开发者_运维问答. There is no way to hide text nodes so we
                // just remove all childNodes. We could hide all elements and remove
                // text nodes but who really cares about the fallback content.
                el.innerHTML = '';


el in the stack is DispHTMLUnknownElement

What can that be?

Thank you?

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I had flot.pie.js which was probably incompatible!