When trying to use the Jones database I get an error.
J = JonesDatabase() works correctly and creates the instance.
J.ramified_at([2,3,5]) generates an exception, both at my local
installation and when executing it on an online notebook at
http://www.sagenb.org/. I copied the stack trace from the second one
below.
When looking into the code, it turns out that the call that causes the
error is
self.root = load(JONESDATA+ "/jones.sobj")
where "load" is a function from the compiled library sage/structure/
sage_object.so.
Traceback (most recent call last):
File "", line 1, in
File "/notebooks/server/sage_notebook/worksheets/doetoe/code/5.py",
line 4, in
J.ramified_at([Integer(2),Integer(3),Integer(5)])
File "/notebooks/server/", line 1, in
File "/sage/local/lib/python2.5/site-packages/sage/databases/
jones.py", line 196, in ramified_at
Z = self.get(S, var=var)
File "/sage/local/lib/python2.5/site-packages/sage/databases/
jones.py", line 167, in get
self.root = load(JONESDATA+ "/jones.sobj")
File "sage_object.pyx", line 433, in sage_object.load
File "sage_object.pyx", line 494, in sage_object.loads
RuntimeError: No module named polynomial_element_generic
invalid data stream
invalid load key, 'x'.
Unable to load pickled data.
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