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我每次尝试在已使用seqformat转换为STS格式的数据上运行seqdef时，都会看到此错误。我的数据帧的样品看起来像seqdef在R中的错误级别
head(df.new, 10)
user_id orderdate cart to
1 8 1 produce 30
2 8 31 produce 60
3 8 61 produce 70
4 8 71 produce 92
5 10 1 produce 30
6 10 31 produce 42
7 10 43 meat seafood 56
8 10 57 deli 77
9 17 1 beverages 3
10 17 4 beverages 8
它具有总共14000行的订单并有一些命令在每个用户的同一天（即订购日期==到），其发生。以下是我用来创建用作seqdef输入的STS数据的代码。
df.form <- seqformat(df.new, id='user_id', begin='orderdate', end='to', status='cart', from='SPELL', to='STS', process=FALSE)
df.seq <- seqdef(df.form, left='DEL', right = 'unknown', xtstep=10, void = 'unknown')
错误信息运行seqdef时，我得到的是
[>] found missing values ('NA') in sequence data
[>] preparing 35000 sequences
[>] coding void elements with 'unknown' and missing values with '*'
[>] 21 distinct states appear in the data:
1 = alcohol
2 = babies
3 = bakery
4 = beverages
5 = breakfast
6 = bulk
7 = canned goods
8 = dairy eggs
9 = deli
10 = dry goods pasta
11 = frozen
12 = household
...
[>] adding special state(s) to the alphabet: unknown
Error in `levels<-`(`*tmp*`, value = if (nl == nL) as.character(labels) else paste0(labels, :
factor level [24] is duplicated
我试着删除其中订购日期==来和相同的错误仍然出现这些订单。我将不胜感激任何帮助，我可以解决这个问题。谢谢。