Stargazer does not show standard errors

Dear Community
I have a problem. I calculated many different models with OLS. Because of heteroskedasticity, I calculated robust standard errors. Because i have Panel data, I calculated a model with Country fixed effects (with least squares dummy variables). The problem is, that stargazer opens me a table without standard errors in parentheses. The table that i receive shows just the coefficiennts. Therefore, I cannot see whether the estimates are significant.
R was not able to compute the robust standard errors using the command below(NaN for every variable...)
I have over 20 dummy variables . Is it possible that the problem might arise because of this? In the model with time fixed effects (4 Dummy variables), everything worked.


(fixed.time1 is the name of my regression model)

Thank you for your help in advance!