我在run xtabond2命令，总是出现如下显示，没有结果。

Favoring space over speed. To switch, type or click on mata: mata set matafavor speed, perm.
J(): 3900  unable to allocate real <tmp>[369420,71]
_MakeIVInsts(): -  function returned error
xtabond2_mata(): -  function returned error
<istmt>: -  function returned error


请指教，如何修正。