fire i delete some package.now i cannot install package. how can i restore my envirement to default?
There is no ‘reset environment’ function, but you can reinstall any deleted library back using the Library Manager dialog.
Or you can just create a new workbook (it will be created with the default libraries) and copy/paste your code here.
Sorry, I missed this point:
Could you give me the details? Are any errors displayed? And what library are you trying to install? Thanks.