I have a managed VF page that is displaying the above error when an action link is clicked -only in a particular subscriber sandbox (it has been working fine in every other org). The link sets a variable in the controller (call it
selection) and re-renders a panel whose content is shown when
selection is set. This panel should display a few things that were fetched via getter methods. Instead the page suddenly is going blank with this error message:
Unable to Access Page
The value of the "" parameter contains a character that is not allowed or the value exceeds the maximum allowed length. Remove the character from the parameter value or reduce the value length and resubmit.
I don't want to get into the code here as I am just trying to see why the parameter in this message is resolving to blank. The Debug Logs are not showing anything at all even with logging levels set to Finest.
I have done my research and seen other similar posts on SFSE, but my issue is with the blank parameter. I am hoping that with this knowledge I can figure out the next step.