Error: The index exceeds matrix dimensions at AllCombinations.TAllCombinations.GetCombinationFromCombinationTree

On calculation of the (cracked) deformation over time, following message appears:

The index exceeds matrix dimensions.
   at AllCombinations.TAllCombinations.GetCombinationFromCombinationTree(Int32 index)
   at el_Bar.TModelBar.CalculateCrackedStiffness(Int32 Combination, Double Betha1, Double Betha2, Boolean DeformationAfterCreep, Boolean ExtendCracking, Boolean resetcracks)
   at ServerHelper.TServerHelper.DetermineCrackedStiffness(@MetaTServerHelper Self, Double Betha1, Double Betha2, Boolean DeformationAfterCreep, Boolean ExtendCracking, Boolean resetcracks, Int32 comboIndex)
   at ServerCalculations.TServerCalculator.DoTimeCombinations(IServerProgress spf)

[NL]: De index ligt buiten de matrixgrenzen.

[FR]: L’indice dépasse les dimensions de la matrice

Solution

There is no combination for cracking defined:

• Go back the Loads configuration  and click on 
• Fill out the 2 columns t₀ and Combination for cracking
  
  1. t₀: time at which the load applies to structure [days]. Example: 28 days is a typical value for the selfweight.
     
  2. Combination for cracking: reference combination for the cracking in time evaluation. Recommended is to take ULS RC 1 (NL: BGT ZC 1, FR: ELS CR 1), as all other evaluation of cracking in Diamonds is based on ULS RC.