Hello I have recently been encountering problems with MultiFit within Chimera on both Ubuntu and Windows 10 (trace from reply log below--I get the same error on both operating systems). Even fitting with datasets that was working earlier in the year (~August-September) is not working anymore. My guess is that some changes have happened on the server that hosts Multifit. Could someone please try and reproduce the bug and let me know how I should troubleshoot this? I am trying to fit a single protein structure to an EM map and as I said, this was working earlier this year. I also tried downloading IMP on my Windows machine and using MultiFit from in there. This was running into some separate issues which I will not go into here since they are not directly related to Chimera. Thanks and best Nimit Trace from reply log: Application stderr ----- Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/generate_assembly_input.py", line 2, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/create_all_surfaces.py", line 2, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/generate_assembly_anchor_graph.py", line 3, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/run_fitting_fft.py", line 2, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/generate_indexes_from_fitting_solutions.py", line 2, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/create_auto_proteomics_file.py", line 6, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/home/socr/a/yz/local/imp-repository/modules/multifit2/bin/align_proteomics_em_atomic_plan.py", line 3, in <module> import IMP.multifit File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 25, in <module> _IMP_multifit = swig_import_helper() File "/home/socr/a/yz/local/imp-debug/build/lib/IMP/multifit/__init__.py", line 17, in swig_import_helper import _IMP_multifit ImportError: libfftw3.so.3: cannot open shared object file: No such file or directory Traceback (most recent call last): File "/usr/local/opal-local/bin/multifitWS.py", line 438, in <module> main() File "/usr/local/opal-local/bin/multifitWS.py", line 46, in main VersionMap[cf["version"]](cf) File "/usr/local/opal-local/bin/multifitWS.py", line 98, in v1_run asymWriteSolution(cf) File "/usr/local/opal-local/bin/multifitWS.py", line 411, in asymWriteSolution raise RuntimeError("Unable to find file combinations.output") RuntimeError: Unable to find file combinations.output -----