All right. I will try a new version. Thank you anyway. On Thursday, April 6, 2017 at 7:05:04 PM UTC+8, Jeroen Demeyer wrote: > > On 2017-04-06 11:37, Peng wrote: > > Yes, it is SAGE 5.7. > > I didn't try the new version. > > Is the old version the reason for this error? > > No idea, but you will not get help for issues in such an old version. >
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