It is on the management console and on the webclient.Where are you exactly getting this error, is it when trying to download a call recording from the Management Console or is it displayed when trying to download from the 3CX webclient as well?
Could you provide a screenshot of the error?
Also, where is this 3CX PBX hosted and what OS is it running on, can you access the file system directly and check if these recordings exist, or are these perhaps archived recordings?

All I was told is that the Reports are working but the recordings are not working.Are you trying to download the file from a PC that is local(same LAN) or remote to the PBX?
From the screenshot it looks like you tried to download the recording file from a Call Report, if that's the case, did you try both links (IP and FQDN):
View attachment 25337
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.