I cannot seem to run a rail application configured to MySQL. When I run

Question

Asked: June 3, 20262026-06-03T08:07:31+00:00 2026-06-03T08:07:31+00:00

I cannot seem to run a rail application configured to MySQL. When I run the project, I get the following error:

193: %1 is not a valid Win32 application. - C:/Ruby193/lib/ruby/gems/1.9.1/gems/mysql-2.8.1-x86-mingw32/lib/1.9/mysql_api.so

I’ve noticed others have hit this but I didn’t find any solutions that worked for me. Here’s what I’ve tried so far:

Can anyone provide guidance here? Is this just a lost cause? Does using Linux or other versions of Ruby/Rails/MySQL combo fix this?

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Editorial Team · Answer 1 · 2026-06-03T08:07:33+00:00

Looks that you installed the binary pre-compiled version of MySQL gem, which requires an specific version of MySQL to be installed.

More important, it requires an specific version of libmysql.dll be available in the PATH so the gem can use it.

I would recommend you uninstall the pre-compiled gem and proceed with the manual compilation steps described here:

This has been answered before too:

Hope that helps.

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