problem to visualize a Particle System

Hi
I tested 5 different Particle System in a separate project; I hidden 4 and tested 1, until have each one in a relative good way. Now I put this separate project inside my game, as a new scene, including the 5 Particles.

The goal: at each end of a game level I would like to call one Particle System, under a background in solid color; when the player press any key the game returns to the normal way.

The problem: I can not do this.
What I tried without success:
a) to call each Particle System using Play(): I lost the solid background

b) to include each Particle System as gameObject under the changeLevel scene: I can't see the effect for error:
There is no 'ParticleSystem' attached to the "GameFlowManager" game object, but a script is trying to access it.
Tried:
stars.GetComponent<ParticleSystem>().Play();
stars.Play();
stars.Emit(10);


c) to create one different scene for each Particle System: the better result, but I can't stop the effect and come back to the game.

Can someone give me directions or sugestions to got it.
Unity 3D 5.6.4f1 windows 10

Thanks in advance,
Josi

 

Please, help... not success yet trying to call different particle system effects at the level end.
1) made 2 Particle System in a separate project: star and firework
2) in a game where I need to show the Particle System:

a) copyed star and firework under a canvas (background dark blue) under a Scene where the effects are needed
b) on the script:

i) declare:

public ParticleSystem stars;
public ParticleSystem fireworks;
and in Inspector made the association to these variables

if I declare as gameObject considering ParticleSystem is obsolet, I do not have stars.particleSystem (it is strikethrough)
​

ii) define on Start ():

stars = GetComponent<ParticleSystem>();
fireworks = GetComponent<ParticleSystem>();​

iii) activate the canvas and one particle System:

screenFireworks.SetActive(true);
stars.Play ();​

I'm getting the error:
MissingComponentException: There is no 'ParticleSystem' attached to the "script" game object, but a script is trying to access it. You probably need to add a ParticleSystem to the game object "script".

If someone can indicate a link with conceptual explanation about this I appreciate.
Thanks in advance.

 

I guess, you access a ParticleSystem, that you retrieved via GetComponent(), that points to null. In this case, Unity outputs that error message as far as I remember.

To narrow down the issue, you could add some "if (screenFireworks == null) Debug.Log" after the GetComponent<ParticleSystem>() call that gets the screenFireworks ParticleSystem for example.

If you know how to use the Visual Studio Debugger, you could add conditional breakpoints instead. This should provide some insight when a ParticleSystem is null and you have some context, such as on which object it's missing.

 

Thank you very much Peter.
I use monoDevelop debug attached to Unity, but for me, it was so clear that the correspondence was made It is really null.

I tried the syntax described here:

1. public GameObject dustPuff;
2. private ParticleSystem dustParticle;
3. 
   
4. void WhateverFunction () {
   1. GameObject dustObject = Instantiate(dustPuff, this.transform.position, this.transform.rotation) as GameObject;
   2. dustParticle = dustObject.GetComponent<ParticleSystem>();
5. }

and now, it is not null, but I'am not getting the effect working, using the syntax described in the same link:

1. var dustPrtcl = dustParticle.emission;
2. dustPrtcl.enabled = true;

Suggestions about what i'm doing wrong?
I'm trying to activate the particle in a panel without character, just enable the firework - is it wrong?