time and group effects investigation in fixed effect model

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Hi,
i need your assistance..
i work on panel data analysis. since i focussed on 27 members of EU, i employed fixed effects model. Series are statioanry in terms of LLC and IPS unit root results. before estimating model, i tested existence of group and time effects and can not accept null hypothesis. That means there have been time and group effects in my model but i dont know how to continue and what to do in order to estimate the model?
Thanks in advance..