Could you help me?

I want to model a scintillator and a detector. My model is very simple.

X -ray incidents to the scintillator and result in optical photons. Then, excluding certain details, photons pass through the scintillator, an optical grease and glass and are registered by detector.

I didn't have any problems when I used rectangular parallelepiped (i.e. G4Box), but now I am trying to use a parallepiped geometry (G4Para) and have an error.

This error emerge if I set up non-zero alpha angle:

G4Para* solid_para = new G4Para("solid_para", scintillator_length_x / 2.0, scintillator_length_y / 2.0, scintillator_height / 2.0, alpha, 0 * degree, 0 * degree); (where alpha = 1*degree, for example)

But if I use zero angles, there are no problems, but this case is qual to G4Box geomegry and is uninteresting for me. In addition, if alpha angle equal to 45 degree, there are no problems too.

Error (for 1 degree angle) :

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav0003
      issued by : G4Navigator::GetGlobalExitNormal()
 WARNING> Expected normal-global-frame to be valid,  i.e. a unit vector!
  - but |normal|   = 57.28996163  - and |normal|^2 = 3282.139704
 which differs from 1.0 by 3281.139704
   n = (0.9998476952,-57.28123609,0)
============================================================
   State of Navigator: 
The current state of G4Navigator is: 
  ValidExitNormal= 1
  ExitNormal     = (0.9998,-57.28,0)
  Exiting        = 1
  Entering       = 0
  BlockedPhysicalVolume= pScintillator
  BlockedReplicaNo     = 0
  LastStepWasZero      = 0

 Current Localpoint = (1.7639561,0.79954604,1.4433903)
 PreviousSftOrigin  = (1.1432369,1.75,0.9989291)
 PreviousSafety     = 2.220446e-016
Current History: 
Level=[0]: Phys Name=[pWorld] Type=[N]

============================================================
Value obtained from stored global-normal is not a unit vector.

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------


Error (for 44 degree angle) :

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav0003
      issued by : G4Navigator::GetGlobalExitNormal()
 WARNING> Expected normal-global-frame to be valid,  i.e. a unit vector!
  - but |normal|   = 1.035530314  - and |normal|^2 = 1.072323031
 which differs from 1.0 by 0.07232303078
   n = (0.7193398003,-0.7448981692,0)
============================================================
   State of Navigator: 
The current state of G4Navigator is: 
  ValidExitNormal= 1
  ExitNormal     = (0.7193,-0.7449,0)
  Exiting        = 1
  Entering       = 0
  BlockedPhysicalVolume= pScintillator
  BlockedReplicaNo     = 0
  LastStepWasZero      = 0

 Current Localpoint = (3.1065107,1.4047079,8.2650118)
 PreviousSftOrigin  = (2.7251633,1.75,8.934397)
 PreviousSafety     = 0
Current History: 
Level=[0]: Phys Name=[pWorld] Type=[N]

============================================================
Value obtained from stored global-normal is not a unit vector.

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------