在用matlab做空间计量时，下列出错提示是什么？

LR-test joint significance spatial fixed effects, degrees of freedom and probability =  869.2768,    46,   0.0000
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
LR-test joint significance spatial fixed effects, degrees of freedom and probability =  869.2768,    46,   0.0000
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
  In Untitled4 at 52
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
  In Untitled4 at 52
Warning: Log of zero.
> In f_resar at 24
  In fminbnd at 176
  In sar_panel_RE at 157
  In Untitled4 at 52