Can you upload a project archive to be examined ?
Consider posting your project, makes life easier to troubleshoot.
“Create Workspace Bundle”
You have 4 mixers each which uses 1 SC/CT block, same for a PGA.
You have a total available of 4. Thats what is causing error.
Oh ok .
Thankyou so much .
In workspace explorer, results tab, towards the bottom of file list is a file named *.rpt,
that shows you the amount of resources you have used.
In your case you have 1 OpAmp left which you could make into a PGA
using analog muxes and an external R network.
Great!! its a nice feature. Did'nt know that before.