Okay. Like the nop Ringo said, that error means that you already have a particle template with the name Weather/Rain.
What you have to do is go to your particle folder (by default: My Computer -> C: Drive -> Feralheart -> Media -> Particles).
Look at your .particle files. See any with a _0, _1, etc. behind their name? If so, delete them. These are copys automatically made (for some wierd reason I don't know yet - maybe a glitch?) and therefore are uneeded.
Be sure you don't delete your main stuff tho, don't kill the original particle template.
That should solve the problem.
Now, if you DON'T have the copies, then you will have to open each .particle file (
in notepad). Since you managed to make a particle yourself, you should know where to check
Look at each system line:
particle_system
Particle (incase you don't know)
Red is the particle template nameSince your particle template is named 'Weather/Rain', make sure that you don't have more than one particle system with Weather/Rain. If you do, delete (if it is a copy) or rename (if it is not a copy).
Hope that helps you