It now work, thank you :)

yup i just checked on my local box and shared hosting box, both works lol. glad it works for you!

Hi, again..
Today I just move to new hosting also with new domain. I found the error again "/!\ error getUserIDFromUserName. /!\ error empty username or access token."
And this time I don't know what caused it, on the data folder there a instagram folder but with the permission 755 and I see it does not work, I remember that you ever tell me to change the permission to 777 but still does not work the .txt file are created on the instagram folder but all the file size is only 0 bytes. 

did you try running upgrade.php? maybe it's a cache issue

if upgrade.php doesn't work then you might need to ssh/ftp into your server and change the ownership, both user and group, of the folder(s)

upgrade.php does not work..
For ssh/ftp to change the ownership I don't know how to do it XD

i'm not sure if shared hosting allows you to ssh into your server but open up a terminal or command prompt (windows) and type in

ssh username@yoursite.com

then go to your elgg directory and type in 

ls -l

typing this command will show you the permissions and ownerships. tell me what you see. usually when you get "/!\ error getUserIDFromUserName. /!\ error empty username or access token." that means it's a permission issue.

if you need help with the ftp, then go here

http://www.siteground.com/tutorials/ftp/ftp_client.htm

also what did you use to see that folder's permission? did you see other infos like who the owner is?

For the permission I can see it I'm using File Manager on cPanel but I can see the owner

is there an option where you can fix ownership in cpanel?

Hmm.. I guess no.. =.="

hmm, did you try reuploading the plugin?

Ok, will try it..

ok let me know

Wait, I have a connection problem can't access my site =.="

I have try re-upload it. Still does not work. I re-install my elgg site also with your plugins XD

are you still getting the empty username? and is the folder instagram made and being populated?

Yes..
/!\ error getUserIDFromUserName. /!\ error empty username or access token.
Yes, also inside the instagram folder have .txt file but it size 0 bytes

Did you clear your browser cookies? And I tried registering to your site but you disabled it. Let me register so I can see what's going on. Make me a demo account.

Yes. I clear the cookies,cache.. Run flush cache, upgrade.php, try changing another instagram username..
Ok.. Username: tester password: tester123 if wrong tester1234 XD

what user and group does the instagram folder belongs to? and also what user and group does the whole elgg folders and files belong to? make sure they're the same user/group

The group and user can't be seen on the cPanel, file manager

then you should ask your host to set the proper permission

o.O
My host ask me to contact you

hmm, if i want to debug it for you then i'd have to have access (ssh) to your server but that's only if you trust me lol. i don't know why you're having problems when it was working before. i still think it's a permission issue via user/group