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Hi,</div>
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I'm trying to add by hand AHFinderDirect to the&nbsp;nsnstohmns.par i this way:</div>
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ActiveThorns = &quot;AHFinderDirect&quot;
<div>AHFinderDirect::find_after_individual_time[1] = 100</div>
<div>AHFinderDirect::find_every = 64</div>
<div>AHFinderDirect::output_h_every = 128</div>
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<div>AHFinderDirect::geometry_interpolator_name = &quot;Lagrange polynomial interpolation&quot;</div>
<div>AHFinderDirect::geometry_interpolator_pars = &quot;order=4&quot;</div>
<div>AHFinderDirect::surface_interpolator_name = &quot;Lagrange polynomial interpolation&quot;</div>
<div>AHFinderDirect::surface_interpolator_pars = &quot;order=4&quot;</div>
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<div>AHFinderDirect::initial_guess_method [1] = &quot;coordinate sphere&quot;</div>
<div>AHFinderDirect::initial_guess__coord_sphere__radius[1] &nbsp; = 1.0</div>
<div>AHFinderDirect::initial_guess__coord_sphere__x_center[1] = 0.0</div>
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<div>AHFinderDirect::N_horizons = 1</div>
<div>AHFinderDirect::origin_x[1] = 0</div>
<div>AHFinderDirect::max_allowable_horizon_radius[1] = 3</div>
<div>AHFinderDirect::which_surface_to_store_info[1] &nbsp;= 0</div>
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<div>AHFinderDirect::move_origins = &quot;yes&quot;</div>
<div>AHFinderDirect::predict_origin_movement = &quot;yes&quot;</div>
<div>AHFinderDirect::reshape_while_moving = &quot;yes&quot;</div>
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<div>AHFinderDirect::reset_horizon_after_not_finding[1] = &quot;no&quot;</div>
<div>AHFinderDirect::track_origin_from_grid_scalar[1] = &quot;yes&quot;</div>
AHFinderDirect::track_origin_from_grid_scalar[2] = &quot;yes&quot;<br>
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I get this error when running:</div>
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<div>&nbsp; while executing schedule bin CCTK_POSTSTEP, routine AHFinderDirect::AHFinderDirect_find_horizons</div>
<div>&nbsp; in thorn Cactus, file /home/babiuc/Cactus/configs/bns/build/Cactus/main/GroupsOnGH.c:290:</div>
<div>&nbsp; -&gt; Invalid variable name '' in CCTK_VarDataPtr</div>
<div>cactus_bns: /home/babiuc/Cactus/configs/bns/build/AHFinderDirect/driver/Newton.cc:109: void AHFinderDirect::track_origin(const cGH*, AHFinderDirect::patch_system&amp;, AHFinderDirect::AH_data*, int, bool): Assertion `ox' failed.</div>
<div>Rank 0 with PID 68131 received signal 6</div>
<div>Writing backtrace to AHFg2nsnstohmns/backtrace.0.txt</div>
Aborted (core dumped)<br>
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Can you please help me understand what I am doing wrong?</div>
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Maria</div>
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<div dir="ltr">_______________________</div>
<div dir="ltr"><i><font size="2">Maria C. Babiuc Hamilton, Ph.D.</font></i></div>
<div dir="ltr"><i><font size="2">Professor, Department of Physics&nbsp;</font></i></div>
<div dir="ltr"><i style="font-size:12pt"><font size="2"><i style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><font size="2"></font></i>College of Science,&nbsp;</font></i><i style="font-size:12pt"><font size="2">Marshall University,</font></i></div>
<div dir="ltr"><i><font size="2">1 John Marshall Drive,&nbsp;</font></i><i style="font-size:12pt"><font size="2">Huntington, WV, 25755</font></i></div>
<div dir="ltr"><i><font size="2"><i style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><font size="2"><i style="font-size:12pt"><font size="2">Room S&nbsp;257,&nbsp;<span id="ms-rterangepaste-start"></span><i style="font-size:16px"><font size="2">Phone:
 (304)696-2754</font></i></font></i></font></i><br>
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