请教各位达人，我在用eviews6.0做面板数据单位根检验的时候检验结果里没有临界值，不知道该怎么办，请大家帮我分析一下

Date: 03/03/09   Time: 14:06    
Sample: 2001 2007    
Exogenous variables: Individual effects, individual linear trends    
Automatic selection of maximum lags    
Automatic selection of lags based on AIC: 0    
Total (balanced) observations: 64    
Cross-sections included: 16 (2 dropped)    
    
Method   Statistic Prob.**
ADF - Fisher Chi-square    32.2167  0.4560
ADF - Choi Z-stat               0.87579  0.8094
    
** Probabilities for Fisher tests are computed using an asymptotic Chi    
        -square distribution. All other tests assume asymptotic normality.