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tshark syntax error

I am working on an assignment and having trouble with the syntax. Below is the prompt and command I am using. I had to map to tshark then add the command.

C:\Windows\system32>"c:\Program Files\Wireshark\tshark" -x -n SYNscan.txt

Below is the error

Capturing on 'Npcap Loopback Adapter' tshark: Invalid capture filter "SYNscan.txt" for interface 'Npcap Loopback Adapter'.

That string isn't a valid capture filter (syntax error in filter expression). See the User's Guide for a description of the capture filter syntax. 0 packets captured

tshark syntax error

I am working on an assignment and having trouble with the syntax. Below is the prompt and command I am using. I had to map to tshark then add the command.

C:\Windows\system32>"c:\Program Files\Wireshark\tshark" -x -n SYNscan.txt

SYNscan.txt

Below is the error

Capturing on 'Npcap Loopback Adapter'
tshark: Invalid capture filter "SYNscan.txt" for interface 'Npcap Loopback Adapter'.

Adapter'.

That string isn't a valid capture filter (syntax error in filter expression). See the User's Guide for a description of the capture filter syntax. 0 packets captured

captured