请求大佬帮忙看下程序哪里出错了，小白一个论文急需啊啊啊：谢谢谢谢！！
不知道哪里错了，项目区分度难度都不应该是这么大的数字埃数据的EXCEL放在附件了谢谢各位大佬！！！

> install.packages("ltm")
--- 在此連線階段时请选用CRAN的鏡子 ---
试开URL’https://mirrors.tongji.edu.cn/CRAN/bin/windows/contrib/4.1/ltm_1.1-1.zip'
Content type 'application/zip' length 705388 bytes (688 KB)
downloaded 688 KB

package ‘ltm’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
C:\Users\sky\AppData\Local\Temp\Rtmp6bWWD5\downloaded_packages
> library(ltm)
载入需要的程辑包：MASS
载入需要的程辑包：msm
载入需要的程辑包：polycor
> setwd("c:/mystudy/RIRT")
> ddd<-read.fwf("data1.csv", widths=c(1,rep(1,18)))
> dim(ddd)
[1] 26 19
> ddd <- ddd[,-1]
> names(ddd) <- paste("It",1:18, sep="")
> mod.2pl <- ltm(ddd~z1, IRT.param=T)
> mod.2pl$conv
[1] 0
> summary(mod.2pl)
Error in solve.default(object$hessian) :
Lapack例行程序dgesv: 系统正好是奇异的: U[3,3] = 0
> coef(mod.2pl)
Dffclt Dscrmn
It1-1.398595e+09 4.687995e-08
It2-2.797913e+00 1.694660e-01
It3-1.398595e+09 4.687995e-08
It4-5.958137e-01 5.651422e-01
It5-1.398595e+09 4.687995e-08
It6-2.154298e+00 1.450527e-01
It7-1.398595e+09 4.687995e-08
It8-2.313392e-01 3.893327e+00
It9-1.398595e+09 4.687995e-08
It10 -2.947178e+00 3.487284e-01
It11 -1.398595e+09 4.687995e-08
It12 -3.548480e-01 3.164737e+00
It13 -1.398595e+09 4.687995e-08
It14 -4.610567e-01 7.744310e-01
It15 -1.398595e+09 4.687995e-08
It16 -1.621804e+01 3.924119e-02
It17 -1.398595e+09 4.687995e-08
It18 -1.802842e+00 2.659201e-01
> factor.scores(mod.2pl, method="EAP")
Call:
ltm(formula = ddd ~ z1, IRT.param = T)

Scoring Method: Expected A Posteriori

Factor-Scores for observed response patterns:
It1 It2 It3 It4 It5 It6 It7 It8 It9 It10 It11 It12 It13 It14 It15 It16
1 1 0 1 0 1 0 1 1 1 0 1 0 1 0 1 1
2 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1 0
3 1 0 1 0 1 1 1 0 1 1 1 0 1 0 1 0
4 1 0 1 0 1 1 1 0 1 1 1 0 1 1 1 1
5 1 0 1 1 1 0 1 1 1 1 1 1 1 0 1 1
6 1 0 1 1 1 0 1 1 1 1 1 1 1 1 1 1
7 1 0 1 1 1 1 1 0 1 0 1 0 1 0 1 1
8 1 0 1 1 1 1 1 0 1 0 1 1 1 1 1 1
9 1 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1
10 1 1 1 0 1 0 1 0 1 0 1 0 1 1 1 0
11 1 1 1 0 1 0 1 0 1 0 1 1 1 0 1 0
12 1 1 1 0 1 0 1 0 1 1 1 0 1 0 1 1
13 1 1 1 0 1 0 1 0 1 1 1 1 1 1 1 1
14 1 1 1 0 1 0 1 1 1 1 1 1 1 1 1 1
15 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 0
16 1 1 1 0 1 1 1 1 1 1 1 1 1 0 1 1
17 1 1 1 1 1 0 1 0 1 1 1 0 1 0 1 1
18 1 1 1 1 1 1 1 0 1 1 1 0 1 0 1 0
19 1 1 1 1 1 1 1 0 1 1 1 0 1 1 1 1
20 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1
21 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1
22 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0
23 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
24 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
25 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
It17 It18 Obs Exp z1 se.z1
1 1 1 1 0.008 -0.351 0.438
2 1 0 1 0.0380.533 0.586
3 1 1 1 0.078 -1.184 0.603
4 1 1 1 0.089 -0.926 0.527
5 1 0 1 0.0650.477 0.568
6 1 1 2 0.3000.884 0.685
7 1 0 1 0.046 -1.188 0.604
8 1 1 1 0.022 -0.208 0.433
9 1 1 1 0.043 -0.005 0.441
10 1 0 1 0.023 -1.119 0.583
11 1 0 1 0.008 -0.521 0.449
12 1 1 1 0.160 -1.161 0.596
13 1 1 1 0.053 -0.244 0.434
14 1 1 1 0.2510.711 0.638
15 1 0 1 0.0470.388 0.540
16 1 1 1 0.1650.482 0.570
17 1 0 1 0.100 -1.060 0.566
18 1 1 1 0.080 -0.948 0.533
19 1 0 1 0.083 -0.804 0.495
20 1 0 1 0.1140.750 0.649
21 1 1 1 0.2290.868 0.681
22 1 1 1 0.1660.669 0.626
23 1 0 1 0.2180.888 0.687
24 1 1 1 0.4531.020 0.719
25 1 1 1 0.8911.040 0.724