Minecraft java.io.IOException: CreateProcess error=87, El parámetro no es correcto

Ayuda enserio ya no se que hacer se me aparece esto. Porfa necesito su ayuda?

java.io.IOException: Cannot run program «» (in directory «C:\Users\imano\AppData\Roaming\MC\MultiMinecraft2\Instancias\2\.minecraft»): CreateProcess error=87, El parámetro no es correcto
at java.lang.ProcessBuilder.start(Unknown Source)
at aL.a(JavaProcessLauncher.java:26)
at al.b(GameLauncher.java:411)
at al.a(GameLauncher.java:710)
at bE.b(DownloadJob.java:122)
at bE.a(DownloadJob.java:14)
at bE$1.run(DownloadJob.java:92)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: CreateProcess error=87, El parámetro no es correcto
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.(Unknown Source)
at java.lang.ProcessImpl.start(Unknown Source)
… 12 more

Gracias