PS2 ISO compression GZ how to compress multiple files ?

[silverchair]

I tried to use the script from this thread along with different versions of 7z.exe and always get the error:
 

Scan WARNINGS for files and folders:

Crash Bandicoot - The Wrath of Cortex (USA) (v1.01).iso : The system cannot find the file specified.
----------------
Scan WARNINGS: 1


System ERROR:
The parameter is incorrect.
Press any key to continue . . .

I can confirm there is a single .iso inside the .7z and it has the same name as the archive. What am I missing?

[Norfair]

19 hours ago, silverchair said:

I tried to use the script from this thread along with different versions of 7z.exe and always get the error:
 

Scan WARNINGS for files and folders:

Crash Bandicoot - The Wrath of Cortex (USA) (v1.01).iso : The system cannot find the file specified.
----------------
Scan WARNINGS: 1


System ERROR:
The parameter is incorrect.
Press any key to continue . . .

I can confirm there is a single .iso inside the .7z and it has the same name as the archive. What am I missing?

It was a long time ago I write this batch script, but dig you put the 7z-files in seperate subfolders?