Don‘t think so. How do you obtain the IP address? Is this happening on your router or a public network?
The message just tells you that within the network you‘re in your IP address is also assigned to someone else, hence it is not unique withing the network any more.
This is not per se a security issue; however it may cause disruption in network services. Imagine your phone number is assigned to someone else too. May - and probably will - cause issues