I am trying to run DESeq analysis

lv.dds.excov <- DESeq(lv.dds.excov

It has been running fine, but then I introduced some new covariates (they were already in the file I just did not call on them before and now I am receiving this warning message:

Warning message:
In normalizePath(path.expand(path), winslash, mustWork) :
  path[1]="": The filename, directory name, or volume label syntax is incorrect

Could someone explain why this has happened? I haven't changed the files or their paths in anyway?

Can you show the command that produced this error?

Also can you run traceback() after the error?