Traceback (most recent call last):


 "/usr/local/lib/python3.6/dist-packages/mpmath/calculus/optimization.py", line 928, in findroot

fx = f(*x0)
TypeError: <lambda>() takes 1 positional argument but 2 were given

Traceback (most recent call last):

 "/usr/local/bin/ipython", line 11, in <module>
sys.exit(start_ipython())

 "/usr/local/lib/python2.7/site-packages/IPython/**init**.py", line 118, in start_ipython
return launch_new_instance(argv=argv, *_kwargs)

 "/usr/local/lib/python2.7/site-packages/traitlets/config/application.py", line 592, in launch_instance
app.start()

 "/usr/local/lib/python2.7/site-packages/IPython/terminal/ipapp.py", line 349, in start
return self.subapp.start()

 "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 286, in start
self.convert_notebooks()

 "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 409, in convert_notebooks
self.convert_single_notebook(notebook_filename)

 "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 380, in convert_single_notebook
output, resources = self.export_single_notebook(notebook_filename, resources)

 "/usr/local/lib/python2.7/site-packages/nbconvert/nbconvertapp.py", line 332, in export_single_notebook
output, resources = self.exporter.from_filename(notebook_filename, resources=resources)

 "/usr/local/lib/python2.7/site-packages/nbconvert/exporters/exporter.py", line 166, in from_filename
return self.from_notebook_node(nbformat.read(f, as_version=4), resources=resources, *_kw)

 "/usr/local/lib/python2.7/site-packages/nbconvert/exporters/pdf.py", line 139, in from_notebook_node
raise RuntimeError("PDF creating failed")RuntimeError: PDF creating failed