Given no other information and since the logger doesn’t show the error, I’m going to guess it is this bug, which was actually a bug with Logger, which turned out to be a bug with :dbg_ieval, which is part of the debugger in OTP. @josevalim fixed the :dbg_ieval bug, but that means you need to wait until the next version of OTP to be released to get the fix (or erlc just that module to get the fix).
You can work around the problem for now by excluding modules from being interpreted that trigger the bug. In most cases this will be modules that have Logger calls that take an anonymous function and then interpolate inside that anonymous function like
thing = ...
Logger.info(fn -> "thing=#{thing}" end)
