# removing page in PDF-lib show error index must be at least x

removing page in PDF-lib show error index must be at least x and at most x , but actually... assertRange error. Here is how to solve this

Here is how to solve error when removing a page in PDF-lib show error

`index must be at least x and at most x , but actually... assertRange error. `

Even though your PDF pages is correct and removed Index is correct, we can still meet this issue.

**Why?**
Because, when removing a page, PDFlib will shift the index number. It’s a problem when removing a smaller page. Since PDFlib will change all the index number on next pages.

**Solution**

If we’re removing multiple pages, then start ordering the removal from bigger number. So it didn’t shift.

Here’s an example

```
const pages [4 , 1 , 3, 2]
const sortedPages = pages.sort((a: number, b: number) => b - a)
sortedPages.forEach((page: any) => {
const pageIndex = page - 1
PDF_DOC.removePage(pageIndex)
})
```

Hope it can solve your PDF lib problem too!