Trying to populate a bucket but .insert keep returning error (sample below from console):

[2020-06-02 22:21:38] Field [variable] is missing
[2020-06-02 22:21:38] [{“variable”:“ordem”,“value”:“C41081”,“serie”:“315”,“time”:“06-02-2020 19:52:21”,“location”:{“lat”:-23.02194,“lng”:-43.48248},“metadata”:{“velocidade”:0,“direcao”:""}},{“variable”:“ordem”,“value”:“A41322”,“serie”:“315”,“time”:“06-02-2020 21:51:06”,“location”:{“lat”:-22.87433,“lng”:-43.24132},“metadata”:{“velocidade”:0,“direcao”:32}}, …

Which [variable] is it referring to? If I copy the JSON from console it imports fine using Emulator but gives error inside the Analysis.