More details on why this can occur in condition as @Shweta KHAJAPURE mentioned above.
If the condition field is being evaluated when the button is clicked and if the condition evaluates to false this error could occur. To summarize the button displays when the page loads as the condition evaluates to true but due to logic in condition field, it evaluates to false when the button is clicked.
Note: Condition field is not always when button is clicked.
