Check if your PAN card is linked with Aadhaar card or not.
From 1st April if PAN card and Aadhaar card are not linked than that investor will not able to take any trade.
Enter your detail here to check status & link Aadhaar -pan:

If its already linked that you will get pop up that.
" Your PAN is already linked to given Aadhaar"
@kevaljethi's activity - 8398410