error CS0246: The type or namespace name `Particle' could not be found.

Im getting an error saying: Assets/Scripts/Effects/FX_Maker/IGSoft_Resources/Scripts/NcEffect/NcParticleSystem.cs(562,12): error CS0246: The type or namespace name `Particle' could not be found.

The script I have is this:

 void LegacySetRuntimeParticleScale(bool bScale)
 {
     if (m_bLegacyRuntimeScale == false)
         return;

     if (m_pe != null)
     {
         Particle[] parts = m_pe.Particles;
         m_pe.Particles = LegacyScaleParticle(parts, bScale, true);
     }
 }

 public Particle[] LegacyScaleParticle(Particle[] parts, bool bScale, bool bPosUpdate)
 {
     float fScale;

     if (bScale)
          fScale = NcTransformTool.GetTransformScaleMeanValue(transform);
     else fScale = 1 / NcTransformTool.GetTransformScaleMeanValue(transform);

     for (int n = 0; n < parts.Length; n++)
     {
          if (IsMeshParticleEmitter() == false)
         {
             if (m_bWorldSpace)
             {
                 if (bPosUpdate)
                 {
                     Vector3 move =  (m_OldPos - transform.position);
                     if (bScale)
                         parts[n].position -= move * (1 - 1/fScale);
                 }
                 parts[n].position -= transform.position;
                 parts[n].position *= fScale;
                 parts[n].position += transform.position;
             } else {
                  parts[n].position *= fScale;
             }
         }
         parts[n].angularVelocity *= fScale;
         parts[n].velocity *= fScale;
         parts[n].size *= fScale;
     }
     return parts;
 }