CTETRA Error - in Lattice Component

Hi, 

 

I am getting ''CTETRA element 4821 is distorted (zero or negative Jacobian).'' this error in my analysis. In my lattice component i used tetra with 0.5 element size and each unit cell of my component is 1mm x 1mm x 1mm so the whole component size is 10mm x 1mm x 1mm . How the error can be rectified and I tried the same approach for single solid beam there I didnt get any error. I dont know if its because of lattice or I have to change any mesh size ?, I turned off PARAM , CHECKELM  to NO but that doesnt help me and for combining the each unit cell into single one i used Geo-> Solid Edit-> Boolean ( A+B) will this be a problem ? since I tried without combining there was no error but the analysis showed only on one unit cell, So where the problem is any help from experts would be nice . Thanks

 

PS : I have attached my model with BCs for your reference .

 

Kind Regards, 

Muthu

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