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[求助] 优化聚合物结构时出错Total charge is not ZERO

优化多聚噻吩的结构时出错,输入文件如下:
%mem=600MW
%chk=poly2.chk
%nprocshared=16
# opt b3lyp/cc-pvtz

Title Card Required

0 1
C                  1.30606351    0.80252407    0.07216115
C                  0.68735101   -0.43640823   -0.03787158
C                 -0.68979218   -0.43646160   -0.03914487
C                 -1.30860459    0.80232777    0.07059102
S                 -0.00153060    2.02649557    0.17958089
H                  1.20500977   -1.38091472   -0.12202474
H                 -1.20800469   -1.38055460   -0.12333028
Tv                 4.08921795    0.00000000    0.00000000

报错内容是:
-------------------- ATTENTION--------------------
Total charge is not ZERO ---       0.000000001117
-------------------- ATTENTION--------------------

Possible problem detected with PBC diagonalization:
FLenRc= 6.50D+00 SDif= 2.67D+07 STest= 1.73D+08 ThrSDi= 1.00D+01.
Alpha NIter=  20 Fermi level: -50.2079518603   
FoFJK:  IHMeth= 1 ICntrl=     0 DoSepK=T KAlg= 1 I1Cent= 0 FoldK=F
Possible problem detected with PBC diagonalization:
FLenRc= 6.50D+00 SDif= 2.66D+07 STest= 1.73D+08 ThrSDi= 1.00D+01.
Alpha NIter=  20 Fermi level: -69.0222808518   
<P*S>=     41.999999994528 NE=     42.000000000000 Err=-5.47D-09 Lim= 4.20D-09
Possibly not enough cells included in PBC.
Numerical problems in PBC.
Error termination via Lnk1e in /share/apps/g09/l502.exe at Tue Feb 14 16:39:46 2017.
Job cpu time:  0 days 16 hours 44 minutes  3.8 seconds.
File lengths (MBytes):  RWF=    480 Int=      0 D2E=      0 Chk=     28 Scr=      1
之前已经用pvdz成功优化出结构了(就是输入文件中的结构),但是改用pvtz优化后就出错了。
这个结构应该很简单吧,但是为什么会出现总电荷不是零的问题呢?
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