schema file at path is invalid because no version is specified - yaml

Question

I run my dbt command in a loop and save its contents to a .yml file. This works well and generates a schema in my .yml file accurately:
for file in models/l30_mart/*.sql; do
table=$(basename "$file" .sql)
dbt run-operation generate_model_yaml --args "{\"model_name\": \"$table\"}" > test.yml
done
However, in the example above, I am just saving the test.yml file in the root directory. When I try to save the file in another path for example models/l30_mart/test.yml, it doesn't work:
for file in models/l30_mart/*.sql; do
table=$(basename "$file" .sql)
dbt run-operation generate_model_yaml --args "{\"model_name\": \"$table\"}" > models/l30_mart/test.yml
done
In this case, when I open the test.ymlfile, I see this:
12:06:42 Running with dbt=1.0.1
12:06:43 Encountered an error:
Compilation Error
The schema file at models/l30_mart/test.yml is invalid because no version is specified. Please consult the documentation for more information on schema.yml syntax:
https://docs.getdbt.com/docs/schemayml-files
It's probably a syntax mistake. Do I need any quotes to specify the path? or brackets? Why can't I save the .yml file in the same folder? Similarly, something like this and try to save different files with the tablename, it also doesn't work:
for file in models/l30_mart/*.sql; do
table=$(basename "$file" .sql)
dbt run-operation generate_model_yaml --args "{\"model_name\": \"$table\"}" > models/l30_mart/$table.yml
done
In this case, the files either have this output:
20:39:44 Running with dbt=1.0.1
20:39:45 Encountered an error:
Compilation Error
The schema file at models/l30_mart/firsttable.yml is invalid because no version is specified. Please consult the documentation for more information on schema.yml syntax:
https://docs.getdbt.com/docs/schemayml-files
or this (eg in the second tablename.yml file):
20:39:48 Running with dbt=1.0.1
20:39:49 Encountered an error:
Parsing Error
Error reading dbt_4flow: l30_mart/firstablename.yml - Runtime Error
Syntax error near line 2
------------------------------
1 | 20:39:44 Running with dbt=1.0.1
2 | 20:39:45 Encountered an error:
3 | Compilation Error
4 | The schema file at models/l30_mart/firsttablename.yml is invalid because no version is specified. Please consult the documentation for more information on schema.yml syntax:
5 |
Raw Error:
------------------------------
mapping values are not allowed in this context
in "<unicode string>", line 2, column 31
Note that the secondtablename.yml mentions the firsttablename.yml.