how to perform netlist check in orcad capture
The schematic Symbol (Orcad Symbol) pin has two properties, one PIN_NAME and another PIN_NUMBER. You might have ended up giving only the PIN_NUMBER property on the schematic symbol and not the PIN_NAME. In your case, the pin number would have been, I guess, AC16 and the PIN_NAME is missing. You can right click on the schematic symbol ---> Edit Part ---> Double Click on AC16 pin and check if the PIN_NUMBER and PIN_NAME property value strings are added. Adding PIN_NAME property value should solve this problem.
In case that does not solve, go the project menu tree. Select the .dsn file. Go to the tool bar and do a CLEAR CACHE and package the schematic and then generate the netlist and try importing it into Allegro.
Also I noticed that the folder name from which you were trying to import the netlist had spaces in between words. Try replacing the spaces with an underscore "_" or hyphen "-".