Could not load Go-plugin. File was not found" error

Hi, I got this error

Could not load Go-plugin. File was not found" error="plugin file not found" mwPath=/opt/tyk-hybrid/middleware/poc-plugin.so

eventhough in /opt/tyk-hybrid/middleware/ the following file exists:

poc-plugin_v5.2.2_linux_amd64.so

why this happens? There was no error before? What can I go wrong?

my bad, the gateway version has been updated before and I use the old compiler