ERROR: Windows API error 87: The parameter is incorrect. 
ERROR: Info: path="C:\Users\Anu\AppData\Local\MiKTeX\2.9\miktex/data/le\df2c24cb21984fa85003c1ecc818ff83.fndb" 
ERROR: Source: Libraries\MiKTeX\Core\MemoryMappedFile\win\winMemoryMappedFile.cpp 
ERROR: Line: 83 Sorry, but pdflatex did not succeed.
  • I had a problem with MikTex as well but it went mysteriously away again after some time. Problem was with installing a package and also with the MikTex console, but now it works again and I didn't do something special (only thing I can think of is starting TexLive under Cygwin but that shouldn't influence MikTex). – albert Jul 8 '18 at 16:00
  • You can get this error if the miktex console is open when you try to compile. Close it. – Ulrike Fischer Jul 8 '18 at 16:15
  • @UlrikeFischer thanks for the comment, maybe there was still a process lingering in my case, but we will never know as it now works again. – albert Jul 8 '18 at 16:35

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