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Hye there, I'm a beginner user of the Hypermesh. I want to setup an analysis of a panel dentability simulation, using Optistruct. The load is applied via a ball indenter, with an initial 1mm gap between the panel and the ball indenter. The load of 200N applied perpendicular on the panel, and has to simulate a push/release action, so that a maximum and a permanent deformation of the panel can be determined. Model setup done: i) Since the panel will undergo plasticity and the load varies over time, I set the analysis for a NLGEOM loadstep. ii) A contact interface between the ball indenter and panel was generated. PCONT properties was used to replace the contact's property option. PCONT properties with active GPAD_OPT and PCONTX (STFAC=0.01 & GAP=0.5) iii) A TLOAD1 was setup, with the TABLED1 with values [X(1)=0,Y(1)=0], [X(2)=1, Y(2)=1] & [X(3)=2, Y(3)=0] iv) EXCITEID of TLOAD1 used DAREA load type, with dof x (local coordinate system, perpendicular to the panel) set to 200 (200N) v) NLGEOM(impl static) loadstep used. Inserted SPC,NLOAD (set to TLOAD1), NLPARM & TTERM=2.0 However, when I tried to run the analysis, ERROR #1388 popped up. Referenced ID 9 (ID of TLOAD1) in NLOAD, but missing in BULK DATA. When I change the load input to a displacement input, using NLOAD1 load collector with SPCD as EXCITEID, no error occurred during analysis computation. Please help me in determining what's needed to be changed. Shukri.