IndexError : index (number of coords + 1) is out of bounds for axis 0 with size (number of coords + 1) #1

I get this Error Sequence:

File "GUI.py", line 360, in <module> eng.run() File "GUI.py", line 333, in run this.app.event(ev) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\app.py", line 167, in event container.Container.event(self,sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 319, in _event return self.event(e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\theme.py", line 344, in func return m(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\container.py", line 189, in event used = w._event(sub) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 318, in _event self.send(e.type,e) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\pgu\gui\widget.py", line 314, in send func(*args) File "GUI.py", line 174, in recompute_cb Visualize.rebuild(NewNx,NewNy,Visualize.N,Visualize.alpha,airfoil); File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\Visualize.py", line 89, in rebuild u,v,X,Y= Compute(x,y,N,alpha,u_inf,NewNx,NewNy) File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\Flow.py", line 308, in Compute panels = define_panels(x, y, N) # discretizes of the geometry into panels File "C:\Users\egeor\Desktop\F1\PythonWindTunnel\Flow.py", line 68, in define_panels a = (y[I+1]-y[I])/(x[I+1]-x[I]) IndexError: index 83 is out of bounds for axis 0 with size 83

This is my .dat file:

0.99444507 0.10525944 0.99289934 0.10522367 0.98827032 0.10511521 0.98058857 0.10493024 0.96990089 0.10466361 0.95627538 0.10430841 0.93979557 0.10385431 0.92056567 0.10329518 0.89870455 0.10261937 0.87434977 0.10181921 0.84765113 0.10088533 0.81877613 0.9981219 0.78790340 0.9859344 0.75522373 0.9722197 0.72094163 0.9569414 0.68526966 0.9400616 0.64842765 0.9215196 0.61064717 0.9012874 0.57216030 0.8792872 0.53320886 0.8554714 0.49403290 0.8297706 0.45487753 0.8021105 0.41598787 0.7724171 0.37760364 0.7406506 0.33996679 0.7067537 0.30330864 0.6707181 0.26786026 0.6325655 0.23384000 0.5923744 0.20145876 0.5502662 0.17091896 0.5064031 0.14240802 0.4610325 0.11610095 0.4144389 0.9216104 0.3669648 0.7073340 0.3189639 0.5195058 0.2708368 0.3592588 0.2229944 0.2275914 0.1757928 0.1252878 0.1296162 0.0529891 0.0847733 0.0111329 0.0415011 0.0000000 0.0000000 0.0195182 -0.0382795 0.0694565 -0.0719037 0.1494986 -0.1007350 0.2591674 -0.1246324 0.3977713 -0.1434273 0.5644634 -0.1569071 0.7581934 -0.1649307 0.9777673 -0.1673322 0.12218053 -0.1639949 0.14888147 -0.1548749 0.17771268 -0.1399765 0.20849708 -0.1193852 0.24104619 -0.0932489 0.27515864 -0.0618296 0.31062564 -0.0254472 0.34723193 0.0155212 0.38475109 0.0606165 0.42295699 0.1093495 0.46161418 0.1611611 0.50048900 0.2155141 0.53934322 0.2718263 0.57793863 0.3295155 0.61604188 0.3880147 0.65341742 0.4467747 0.68983985 0.5052367 0.72508326 0.5628920 0.75893386 0.6192241 0.79118455 0.6737539 0.82163603 0.7260207 0.85010316 0.7755584 0.87641254 0.8219332 0.90040147 0.8647430 0.92192538 0.9035844 0.94085130 0.9380964 0.95706541 0.9679181 0.97046702 0.9927728 0.98097658 0.10123857 0.98852892 0.10265476 0.99307934 0.10351110 0.99459872 0.10379749 1.00000000 0.10379749