unity Ensure Read/Write is enabled

Question

I new to Unity.

Can some one tell me what this error mean

Ensure Read/Write is enabled on the Particle System's Texture 

Particle system need to play on start but sometimes work(play effect) sometimes not. Thanks

Answer 1

Error because your image has not been marked as enabled

Here's how to fix it

Hope you will fix your mistake

Answer 2

I've got the same error, but with a different reason, so I'd like to share to help others that can get stuck in the same situation:

Cause

1. I was using a Cone shape for particle emission (Shape tab)
2. By my own mistake, I selected Texture Default-ParticleSystem
3. I don't know exactly why, but these Unity Default textures always cause the discussed error
4. In this case it's tricky to find, because Unity doesn't clearly tell which texture is wrongly set (from the Render tab or from the Shape tab).

Solution

1. I've just removed the Shape Texture setting it to "None" then the error disappeared