Unable to Find Buffer to Render Error Message

This is an error message from the drawcanvas plugin. It is usually associated with text elements.

In your tcl scripts that are using canvas commands, check that any tcl variables are initialized to some value before you assign them to a canvas element.

For example, if you are creating a text element on a canvas such as this:

${canvas_id} create text 5.5 14.0 -textvariable myvar -tag "${mytag}"

… make sure that the tcl variable "myvar" is set to something before calling the command above. Otherwise, the drawcanvas plugin will try to render text from a variable that has no valid value, leaving an "Unable to find buffer to render!!!!" error message.