The error is telling you that you do not have a file named forward.fastq.gz in your directory. You can check the contents of the directory using the ls command:
Hi @Aditya. Justine explained the proximal error above. I suspect you have a bigger issue, though. The type argument in your command tells QIIME 2 what type of data you have so that it can be imported correctly. You are telling the framework that you have EMP data, which does not appear to be the case. Please read the importing tutorial, figure out what kind of data you have, and run the command with the appropriate type.