File Not Uploaded on Media space

I registered in kaltura media space and after registration i have got the mail where the link for user panel and admin panel are given.
And some sample media space site are also given.
I open the user panel, login and try to upload a video(.mp4 , 1099 KB only) but every time while upload a video it gives the same error “Oops!upload token not found”.
I will try to upload the another video but same error i got every time.
Same error i got when trying to upload the video of the given sample site,
Please help me!!!

I also need this, can anyone help?