I wonder whether the problem that arise with the following code is specific to my machine, as it seem to work with the documentation example.


EquationTrekker[Derivative[2][y][x] + y[x] == 1, y, {x, Pi/8, Pi}]

(* canvas is not an object with properties
"trekPane" is not an object with properties. *)
  • 1
    $\begingroup$ I have no idea what this is, but I get the same errors in MMA 10.0.0 on OSX 10.10.5. $\endgroup$
    – march
    Commented Sep 2, 2015 at 3:18
  • 1
    $\begingroup$ Same thing with Mathematica 10.2 under OS X 10.10.5. $\endgroup$
    – murray
    Commented Sep 2, 2015 at 19:44
  • $\begingroup$ Same thing with Mathematica 11.2. $\endgroup$
    – murray
    Commented Nov 5, 2017 at 15:45

1 Answer 1


The PropertyValue::pvobj messages emitted are a bug, however they do not affect the functionality. The EquationTrekker GUI window should still open and operate normally (I've tried it on Windows, though Linux may have further problems).

enter image description here

EquationTrekker is based on GUIKit which is being deprecated as far as I know, so this bug may not get a fix.

  • 2
    $\begingroup$ "…GUIKit which is being deprecated as far as I know…" - very sad. OTOH, this does look like something that can now be done by Manipulate[]; I hope someone there would consider rewriting this package. $\endgroup$ Commented Sep 2, 2015 at 4:34

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