Perforce error - cannot submit from non-stream client

Coming from GIT and SVN background, I've set up my P4V in windows, managed to get the content of my repository into my local folder (somehow), but once I made modification and create new files in my local folder, I cant submit it back to Perforce. It gives error:

//depot/main/p4config.txt - warning: cannot submit from non-stream client No files to submit. Submit failed -- fix problems above then use 'p4 submit -c 6'.

My depot hierarchy:

C:\Perforce\kernelpanic\main>p4 client -S //depot/main -o
# A Perforce Client Specification.
#
#  Client:      The client name.
#  Update:      The date this specification was last modified.
#  Access:      The date this client was last used in any way.
#  Owner:       The user who created this client.
#  Host:        If set, restricts access to the named host.
#  Description: A short description of the client (optional).
#  Root:        The base directory of the client workspace.
#  AltRoots:    Up to two alternate client workspace roots.
#  Options:     Client options:
#                      [no]allwrite [no]clobber [no]compress
#                      [un]locked [no]modtime [no]rmdir
#  SubmitOptions:
#                      submitunchanged/submitunchanged+reopen
#                      revertunchanged/revertunchanged+reopen
#                      leaveunchanged/leaveunchanged+reopen
#  LineEnd:     Text file line endings on client: local/unix/mac/win/share.
#  ServerID:    If set, restricts access to the named server.
#  View:        Lines to map depot files into the client workspace.
#  Stream:      The stream to which this client's view will be dedicated.
#               (Files in stream paths can be submitted only by dedicated
#               stream clients.) When this optional field is set, the
#               View field will be automatically replaced by a stream
#               view as the client spec is saved.
#
# Use 'p4 help client' to see more about client views and options.

Client: kernelpanic

Update: 2012/10/04 15:35:16

Access: 2012/10/04 15:59:39

Owner:  me.kernelpanic

Host:   kernelpanic

Description:
        Created by me.kernelpanic.

Root:   C:/Perforce/kernelpanic

Options:        noallwrite noclobber nocompress unlocked nomodtime normdir

SubmitOptions:  submitunchanged

LineEnd:        local

View:
        //depot/... //kernelpanic/...
        //depot/main/doc/... //kernelpanic/main/doc/...
        //depot/* //kernelpanic/*
        //depot/main/* //kernelpanic/main/*

If possible, I'd like to add the files in C:\Perforce\kernelpanic\main\src as well... Please help, I can't understand Perforce. I've tried doing a check out both before or after making modification, but both ways also failed to submit the change to server. I'd love to stick to GIT but our client is using Perforce so we have to play nice with them. Thanks a lot for your help!

It's possible that P4V has guided you to create a stream depot and a mainline, but has somehow created a non-stream workspace for you. From what I've heard, that's likely to happen for first-time P4V users due to something in the setup.

To see if that's the problem, go to Connection/Edit Workspace and look in the 'Stream' field. Is it empty? If so, use Browse to select the stream. This will turn your current workspace into a stream workspace.