'Series' object has no attribute 'data'

[sujeet33]

preparing data...
data prepared
identifying attitude dynamics...
Traceback (most recent call last):
File "/home/sujeet/anaconda3/envs/ulog_tools/bin/ulog_tools_pid_design", line 8, in
sys.exit(main())
File "/home/sujeet/anaconda3/envs/ulog_tools/lib/python3.7/site-packages/ulog_tools/control_opt.py", line 73, in main
res = ut.sysid.attitude_sysid(data, plot=args.plot, verbose=args.verbose)
File "/home/sujeet/anaconda3/envs/ulog_tools/lib/python3.7/site-packages/ulog_tools/_sysid.py", line 223, in attitude_sysid
y=series_diff(bandpass.apply(data['f_gyro_rad_0'])),
File "/home/sujeet/anaconda3/envs/ulog_tools/lib/python3.7/site-packages/ulog_tools/_sysid.py", line 42, in series_diff
dx = np.gradient(series.data, order)
File "/home/sujeet/anaconda3/envs/ulog_tools/lib/python3.7/site-packages/pandas/core/generic.py", line 5487, in getattr
return object.getattribute(self, name)
AttributeError: 'Series' object has no attribute 'data'