CGI script works, but I get "End of script output before headers:" in error_log

Mi cgi script works file, but I get “End of script output before headers:” in the error log file?
What could be the cause of this non-problem

Thanks for help

p.s. here is the full error report:

[Sat Sep 29 15:17:34.073463 2018] [cgi:error] [pid 37266] [client ::1:51453] End of script output before headers: gwd70a.cgi, referer: http://localhost/~Henri/cgi-bin/gwd70a.cgi?b=HenriT_hxxovrgta;pz=henri;nz=gouraud;p=michel&n=gouraud

It’s been a minute since I’ve worked with cgi’s but it might be due to a permission error. Here are a few links I found that show similar errors:

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