ERROR:invalid class “OnDiskMSnExp” object: The number of files does not match the information in experimentData

Hi folks!
I’m trying to analyze the raw-spectra of 102 metabolomic samples, but I got this message several times:
ERROR: invalid class “OnDiskMSnExp” object: The number of files does not match the information in experimentData.
I’m also adding the metadata file. Why is this happening?
Thanks in advance.