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I have Postgres version 10 installed running under windows 10 enterprise using the pl/r interface. It has been working nicely up till now. Now I get ERROR: could not load library "C:/Program Files/PostgreSQL/10/lib/plr.dll": %1 is not a valid Win32 application. error message. I tried to download and replace the Pl/r files (both the 64bit and the 32 bit versions), stopped/restarted the service, but it did not help. Any suggestions?

Hans Passant
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Judit
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  • The Postgres installation location indicates that you are using a 64bit Postgres, so you need to use a 64bit version of PL/r –  Nov 19 '18 at 15:52
  • Tried it, but the message remained the same. – Judit Nov 20 '18 at 10:59

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I found the cause: Rdotnet needed the 32bit version of R and I changed the path (and forgot all about it). The error message was misleading, because it R had the wrong version, not the plr.dll. (if I copied the 32bit version od the dll it still didn't work). So thanks for trying to help.

Judit
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