gtk_button_set_label ERROR

[3saul <saul_lethbridge hotmail com>]

Hi all,

Whenever I call gtk_button_set_label I get the following error and the
function does not succeed.

GTK-CRITICAL **: gtk_button_set_label: assertion 'GTK_IS_BUTTON (button)
failed.

Is there a common reason for this error? I get no errors or warnings when
compiling.
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