I currently have the same problem. Both errors.
#2156 - Based on the information you submitted, you may be subject to minimum tax. Please complete Form T691, Alternative Minimum Tax, in particular the Film property area.Based on the information you submitted, you may be subject to minimum tax. Please complete Form T691, Alternative Minimum Tax, in particular the Resource property and flow-through shares area.Your tax return has not been accepted by the Canada Revenue Agency. It contains errors that must be corrected. Please review the following error(s), make the necessary corrections, and try resubmitting your return. For forms or additional information, visit the Canada Revenue Agency website and the Corrections page on the NETFILE website. For further assistance, please contact us.
#2155 - Most Canadian income tax and benefit returns for 2018, and any balance owing amount, are due on April 30, 2019
A solution would be appreciated