expressions don't work

[jhidding]

Hi, I tried adding a virtual column in Zeldovich sample data, and get an error message. The same thing happens if I try to create a variable. I have installed Vaex in a virtual-env.

An unexpected error occured, you may press ok and continue, but the program might be unstable.

username: 'johannes'
program: 'vaex'
version: '1.0.0-beta.4'
full name: 'vaex-1.0.0-beta.4'
arguments: ['/home/johannes/.local/share/workon/vaex/bin/vaex']
Qt version: '5.8.1'
architecture: ('64bit', '')
dist: ('fedora', '25', 'Twenty Five')
java_ver: ('', '', ('', '', ''), ('', '', ''))
libc_ver: ('glibc', '2.3.4')
linux_distribution: ('Fedora', '25', 'Twenty Five')
mac_ver: ('', ('', '', ''), '')
machine: 'x86_64'
node: 'ESLT0041'
platform: 'Linux-4.9.14-200.fc25.x86_64-x86_64-with-fedora-25-Twenty_Five'
processor: 'x86_64'
python_branch: ''
python_build: ('default', 'Mar 21 2017 17:21:33')
python_compiler: 'GCC 6.3.1 20161221 (Red Hat 6.3.1-1)'
python_implementation: 'CPython'
python_revision: ''
python_version: '3.5.3'
python_version_tuple: ('3', '5', '3')
release: '4.9.14-200.fc25.x86_64'
system: 'Linux'
uname: uname_result(system='Linux', node='ESLT0041', release='4.9.14-200.fc25.x86_64', version='#1 SMP Mon Mar 13 19:26:40 UTC 2017', machine='x86_64', processor='x86_64')
version: '#1 SMP Mon Mar 13 19:26:40 UTC 2017'
win32_ver: ('', '', '', '')

Traceback (most recent call last):
File "/home/johannes/.local/share/workon/vaex/lib/python3.5/site-packages/vaex/ui/columns.py", line 77, in setData
self.dataset.write_meta()
File "/home/johannes/.local/share/workon/vaex/lib/python3.5/site-packages/vaex/dataset.py", line 4382, in write_meta
path = os.path.join(self.get_private_dir(create=True), "meta.yaml")
File "/home/johannes/.local/share/workon/vaex/lib/python3.5/site-packages/vaex/dataset.py", line 4306, in get_private_dir
name = os.path.abspath(self.path).replace("/", "_")[:250] # should not be too long for most os'es
File "/home/johannes/.local/share/workon/vaex/lib64/python3.5/posixpath.py", line 358, in abspath
if not isabs(path):
File "/home/johannes/.local/share/workon/vaex/lib64/python3.5/posixpath.py", line 64, in isabs
return s.startswith(sep)
AttributeError: 'NoneType' object has no attribute 'startswith'

[maartenbreddels]

Thanks, that was a bug indeed, test+fix in d4056fa and 7c7cb2f