Solar Forecast PV

Did you install the kar or jar file? In this topic both the kar and jar file are included, and given the tag kar I assume ithe marketplace addon will take the kar file. However kar files are version specific, which explains why it doesn’t work. Also the kar file is not needed as this binding doesn’t depend on additional libraries, therefore the jar file should be enough. You could try manually installing the jar version, by downloading it and dropping it in the add-ons directory.