Hej Ioannis, 

I got the same error message days ago but It was solved when I wrote the interpolation method

series AMAZON = yahoo_price("AMZN",1)

try the same 

Best and nice weekend to everyone

El vie., 18 sept. 2020 a las 14:50, Ioannis A. Venetis (<ivenetis@upatras.gr>) escribió:

Hello all, especially Jack who wrote the package!!!.

I run gretl2020d on Windows (I think last version of them).

Also I installed yahoo_get 3.0

When running yahoo_get.gfn sample script I get two "errors"

(1) It does not find the redhat ticker

? series redhat = yahoo_price("RHT") # get Red Hat, adjusted price only
Ticker RHT not found
Generated series redhat (ID 1)

(2) it does not fill non-existent ticker with NAs (if that's the expected function here). I get the following

? series foo    = yahoo_price("ZZZ")   # a non-existent ticker will give NAs
An error occurred when 'outfile' was active
jsonget: failed to match JsonPath
*** error in function json2csv, line 1
> dates = strsplit(jsonget(jsonbuf, "$.chart.result[0].timestamp[*]"), "\n")
 called by function write_tempfile
 called by function yahoo_price
 
Error executing script: halting
> series foo    = yahoo_price("ZZZ")   # a non-existent ticker will give NAs
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