# Error while test with tutorials
**URL:** https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402
**Category:** installation
**Created:** [March 20, 2019, 3:49pm UTC](https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402 "2019-03-20T15:49:26Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Dongwei\_Ye](https://fenicsproject.discourse.group/u/Dongwei_Ye)
#### Post date: [March 20, 2019, 3:49pm UTC](https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402/1 "2019-03-20T15:49:26Z")
Hi,
I was trying to run FEniCS with the tutorial examples. However I always meet the error as follow, it always happens at the Expression line, anyone met this problem before? :
Traceback (most recent call last):
File “/usr/lib/python3/dist-packages/dolfin/jit/jit.py”, line 167, in compile\_class
mpi\_comm=mpi\_comm)
File “/usr/lib/python3/dist-packages/dolfin/jit/jit.py”, line 47, in mpi\_jit
return local\_jit(\*args, \*\*kwargs)
File “/usr/lib/python3/dist-packages/dolfin/jit/jit.py”, line 103, in dijitso\_jit
return dijitso.jit(\*args, \*\*kwargs)
File “/home/dongwei/.local/lib/python3.5/site-packages/dijitso/jit.py”, line 144, in jit
params = validate\_params(params)
File “/home/dongwei/.local/lib/python3.5/site-packages/dijitso/params.py”, line 264, in validate\_params
value = as\_str\_tuple(value)
File “/home/dongwei/.local/lib/python3.5/site-packages/dijitso/params.py”, line 194, in as\_str\_tuple
raise RuntimeError(“Expecting a string or list of strings, not %s.” % (p,))
RuntimeError: Expecting a string or list of strings, not {’/usr/include/suitesparse’, ‘/usr/include/eigen3’, ‘/usr/lib/slepcdir/3.7.2/x86\_64-linux-gnu-real/include’, ‘/usr/include/hdf5/openmpi’, ‘/usr/include/scotch’, ‘/usr/lib/openmpi/include/openmpi/opal/mca/event/libevent2021/libevent’, ‘/usr/lib/openmpi/include/openmpi’, ‘/usr/lib/petscdir/3.7.3/x86\_64-linux-gnu-real/include’, ‘/usr/lib/openmpi/include’, ‘/usr/lib/openmpi/include/openmpi/opal/mca/event/libevent2021/libevent/include’}.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File “untitled.py”, line 8, in
u\_D = Expression(‘std::1 + x[0]_x[0] + 2_x[1]\*x[1]’, degree=2)
File “/usr/lib/python3/dist-packages/dolfin/function/expression.py”, line 376, in **init**
self.\_cpp\_object = jit.compile\_expression(cpp\_code, params)
File “/usr/lib/python3/dist-packages/dolfin/function/jit.py”, line 158, in compile\_expression
expression = compile\_class(cpp\_data, mpi\_comm=mpi\_comm)
File “/usr/lib/python3/dist-packages/dolfin/jit/jit.py”, line 170, in compile\_class
raise RuntimeError(“Unable to compile C++ code with dijitso”)
RuntimeError: Unable to compile C++ code with dijitso
---
### Author:  [@ncowley](https://fenicsproject.discourse.group/u/ncowley)
#### Post date: [March 21, 2019, 2:43pm UTC](https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402/2 "2019-03-21T14:43:11Z")
I’m getting the same error, did you manage to find a solution to this?
---
### Author:  [@Rudy](https://fenicsproject.discourse.group/u/Rudy)
#### Post date: [March 21, 2019, 6:59pm UTC](https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402/3 "2019-03-21T18:59:33Z")
Could you post a minimum working example that reproduces the error?
---
### Author:  [@OsbertWang](https://fenicsproject.discourse.group/u/OsbertWang)
#### Post date: [October 11, 2019, 2:57pm UTC](https://fenicsproject.discourse.group/t/error-while-test-with-tutorials/402/4 "2019-10-11T14:57:47Z")
[https://fenicsproject.discourse.group/t/error-running-demo-code/290/2](https://fenicsproject.discourse.group/t/error-running-demo-code/290/2)
Here, [johannr](https://fenicsproject.discourse.group/u/johannr) gave one solution.