Could provide us with more information so we can try to reproduce the issue? What plugin are you trying to install? What exact error are you facing?
Also, we have a Support Tool that will gather relevant information for us to analyze your configuration. Could you please download and execute it on the machine where the stack is running by following the steps described in the guide below?
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.