System is computationally singular when using parametric methods

Hello
when I try to generate synthetic data using parametric method, I'm getting the following error:
  Error in solve.default(xtx + diag(pen)) : 
    system is computationally singular: reciprocal condition number = 6.01891e-17

I tried to drop features that are highly correlated (with correlation coefficient more than 0.8) but the error still exist. is there any way to fix this error?