Using specutils to code a 3D spectra Time-series

[Petra63]

I have several FITS files that I have downloaded from DACE CCF spectra
(https://dace.unige.ch/sun/?)

I would like to create a 3d-spectra-timeseries-with-python

This is an example of one of the filenames on the DACE database
r.HARPN.2018-01-18T14:20:10.645_CCF_A.fits

XTENSION= 'IMAGE ' / IMAGE extension
BITPIX = -32 / number of bits per data pixel
NAXIS = 2 / number of data axes
NAXIS1 = 49 / length of data axis 1
NAXIS2 = 70 / length of data axis 2
PCOUNT = 0 / required keyword; must = 0
GCOUNT = 1 / required keyword; must = 1
EXTNAME = 'SCIDATA '
CHECKSUM= 'T9gHV8fFT8fFT8fF' / HDU checksum updated 2020-08-25T17:28:02
DATASUM = '2349888738' / data unit checksum updated 2020-08-25T17:28:02

I have attempted to follow the coding on the following site
(https://stellartrip.net/3d-spectra-timeseries-with-python/?lang=en)

However I am getting an errors, is there a standard code that I can use to add several FITS files to generate a MESHplot.
KeyError: "Keyword 'CDELT1' not found."

More info on the file
SIMPLE = T / file does conform to FITS standard
BITPIX = 8 / number of bits per data pixel
NAXIS = 0 / number of data axes
EXTEND = T / FITS dataset may contain extensions
COMMENT FITS (Flexible Image Transport System) format is defined in 'Astronomy
COMMENT and Astrophysics', volume 376, page 359; bibcode: 2001A&A...376..359H
DATE = '2020-08-25T17:28:02' / file creation date (YYYY-MM-DDThh:mm:ss UT)
VERSION = 120203 / Application parameter value
DWELL = 300000 / Application parameter value
RD_TIME = 0 / Application parameter value
RS_TIME = 383 / Application parameter value
FRM_TYPE= 1 / Application parameter value
NUM_EXPS= 1 / Application parameter value
EL_GAIN = 1 / Application parameter value
SPEED = 1 / Application parameter value
SER_REG = 0 / Application parameter value
CLK_MON1= 0 / Application parameter value
CLK_MON2= 1 / Application parameter value
TELESCOP= 'TNG '
TIMESYS = 'UTC ' / Explicit time scale specification
DATE-OBS= '2018-01-18T14:20:10.645' / Date and time of start of obs. in UTC
PROCESS = 'Single raw read' / Data processing mode
FILENAME= 'HARPN.2018-01-18T14-20-10.645.fits' / FITS file generatedName
TIME = '14:25:31' / Time FITS file was written