It depends on your filing requirement. If you were required to file a 2017 federal return, then you are also required to file a Louisiana state return. If you were not required to file a federal return and are doing so to claim a refund, then you are not required to file one.
According to the Louisiana Department of revenue, residents, part-year residents of Louisiana, and nonresidents with income from Louisiana sources who are required to file a federal income tax return must file a Louisiana Individual Income Tax Return.
Please view the Louisiana link below for more information.
http://revenue.louisiana.gov/individualincometax
Please view my (screenshot) below to determine if you were required to file a 2017 federal return. If your total income is over the threshold for your 2017 filing status, then you need to file a 2017 Louisiana return.