VIM can't parse the colour scheme file

[egefeyzioglu]

When trying to switch to the colour scheme, VIM version 8.0.1453 (newest at the time of writing) produces the following error

line   51:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:N1, s:N2, s:N3)
line   52:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:I1, s:I2, s:I3)
line   53:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:V1, s:V2, s:V3)
line   54:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:V1, s:V2, s:V3)
line   55:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:R1, s:R2, s:R3)
line   61:
E117: Unknown function: airline#themes#generate_color_map
E15: Invalid expression: airline#themes#generate_color_map(s:IA, s:IA, s:IA)
line   67:
E716: Key not present in Dictionary: normal.airline_warning = s:WARNING
line   68:
E716: Key not present in Dictionary: insert.airline_warning = s:WARNING
line   69:
E716: Key not present in Dictionary: visual.airline_warning = s:WARNING
line   70:
E716: Key not present in Dictionary: replace.airline_warning = s:WARNING
line   72:
E716: Key not present in Dictionary: normal.airline_error = s:ERROR
line   73:
E716: Key not present in Dictionary: insert.airline_error = s:ERROR
line   74:
E716: Key not present in Dictionary: visual.airline_error = s:ERROR
line   75:
E716: Key not present in Dictionary: replace.airline_error = s:ERROR
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