I am doing a panel data analysis and I am having this warning "Lapack routine dgesv: system is exactly singular: U[1,1] = 0". How do I solve this?

I am doing a panel data analysis in R Software which is truncated with more than 700 firms and a 20 year sample period. While using the "trunc" option in the pldv function, it gives this...

17 March 2021 1,476 2 View