"... Only compatible with Spark Unforged 1.5.2 (you have 1.1.1.140)"
Problem is... 1.5.2 doesn't exist? So... what? lol
Are there other conflicts that perhaps it meant to say rather than Spark Unforged?

Because Spark Unforged isn't Spark, its a knockoff. Use Spark, or Flare.

OHHHH! Lol! That's honestly really funny. xD
Thanks!