I have an epoxy system of DGEBA and TETA as the curing agent without the crosslinks which I have constructed using the Amorphous Cell Module. I want to add a CNT to the center of the cell. I tried using the Amorphous cell Module to construct the CNT along with the DGEBA and TETA and then using the create centroid and managing the fractional XYZ in the properties explorer, I moved the CNT to the center of the cell. but the problem is that after this I get the error ''the changes to the document have invalidated the trajectory''. so I cannot perform any other procedure on my cell after this. how can I solve this problem? I definitely need my CNT at the center and the epoxy molecule and the curing agent molecule around it and then I want to use the xlink script to carry out cross-linking.