[Haskell-cafe] Problem with submitting papers for haskell 2018

[winter]

Dear all,

    Currently i and my friends @sighingnow are writing a paper on our 
new I/O manager based on libuv. We planed to submit it to Haskell 2018, 
and according to the official site's info, the deadline should be next 
month: https://icfp18.sigplan.org/track/haskellsymp-2018-papers

But here is my problem, i registered an account on easychair as Haskell 
2019 required and logged in, but when i click the submit link, a page 
with following info are provided:

 > Paper submission for Haskell 2018 is closed.,,You seem to have no 
previous roles at Haskell 2018, so > you cannot enter its pages. If you 
have questions about the conference, please contact Haskell 2018 > chairs.

What does this mean? Did i miss the submission window? Or do i have to 
do some extra preparations? Please help!


Cheers~

Winter