Bonjour Sylvain,
Parfait, je n'ai plus l'erreur de la lib Ruby utilisé, par contre 
J'ai un problème de compilation yarn qui est la suivante :
yarn install v1.22.10
[1/4] Resolving packages...
[2/4] Fetching packages...
error Couldn't find the binary git
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
AuthProvider Load (0.4ms) SELECT "auth_providers".* FROM "auth_providers" WHERE "auth_providers"."status" = $1 LIMIT $2 [["status", "active"], ["LIMIT", 1]]
AuthProvider Load (0.3ms) SELECT "auth_providers".* FROM "auth_providers" WHERE "auth_providers"."status" = $1 LIMIT $2 [["status", "active"], ["LIMIT", 1]]
2021-10-04T12:53:38.472Z pid=1 tid=osxhqxrzx middleware=SidekiqUniqueJobs::Client::Middleware unique_digest=uniquejobs:86311f9a63c73dba95cf40e8c8a07b12 INFO: Adding dead VersionCheckWorker job 0bd298600b7faa9cd02c6217
AuthProvider Load (0.5ms) SELECT "auth_providers".* FROM "auth_providers" WHERE "auth_providers"."status" = $1 LIMIT $2 [["status", "active"], ["LIMIT", 1]]
AuthProvider Load (0.4ms) SELECT "auth_providers".* FROM "auth_providers" WHERE "auth_providers"."status" = $1 LIMIT $2 [["status", "active"], ["LIMIT", 1]]
Compiling...
Compilation failed:
DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($num, $num * 0 + 1)
More info and automated migrator: https://sass-lang.com/d/slash-div
╷
23 │ @return $num / ($num * 0 + 1);
│ ^^^^^^^^^^^^^^^^^^^^^
╵
app/frontend/src/stylesheets/app.functions.scss 23:11 strip-unit()
app/frontend/src/stylesheets/app.functions.scss 28:11 convert-to-rem()
app/frontend/src/stylesheets/app.functions.scss 61:13 rem-calc()
app/frontend/src/stylesheets/bootstrap_and_overrides.scss 121:16 @import
app/frontend/src/stylesheets/application.scss 2:9 @import
app/frontend/packs/application.scss 18:9 root stylesheet
DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div(strip-unit($value), strip-unit($base-value))
More info and automated migrator: https://sass-lang.com/d/slash-div
╷
28 │ $value: strip-unit($value) / strip-unit($base-value) * 1rem;
│ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
╵
app/frontend/src/stylesheets/app.functions.scss 28:11 convert-to-rem()
app/frontend/src/stylesheets/app.functions.scss 61:13 rem-calc()
app/frontend/src/stylesheets/bootstrap_and_overrides.scss 121:16 @import
app/frontend/src/stylesheets/application.scss 2:9 @import
app/frontend/packs/application.scss 18:9 root stylesheet
DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($line-height-computed, 2)
More info and automated migrator: https://sass-lang.com/d/slash-div
╷
28 │ margin-bottom: ($line-height-computed / 2);
│ ^^^^^^^^^^^^^^^^^^^^^^^^^
╵
node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_type.scss 28:19 @import
app/frontend/src/stylesheets/bootstrap_and_overrides.scss 1075:9 @import
app/frontend/src/stylesheets/application.scss 2:9 @import
app/frontend/packs/application.scss 18:9 root stylesheet
DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($line-height-computed, 2)
More info and automated migrator: https://sass-lang.com/d/slash-div
╷
38 │ margin-top: ($line-height-computed / 2);
│ ^^^^^^^^^^^^^^^^^^^^^^^^^
╵
node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_type.scss 38:16 @import
app/frontend/src/stylesheets/bootstrap_and_overrides.scss 1075:9 @import
app/frontend/src/stylesheets/application.scss 2:9 @import
app/frontend/packs/application.scss 18:9 root stylesheet
DEPRECATION WARNING: Using / for division is deprecated and will be removed in Dart Sass 2.0.0.
Recommendation: math.div($line-height-computed, 2)
More info and automated migrator: https://sass-lang.com/d/slash-div
╷
39 │ margin-bottom: ($line-height-computed / 2);
│ ^^^^^^^^^^^^^^^^^^^^^^^^^
╵
node_modules/bootstrap-sass/assets/stylesheets/bootstrap/_type.scss 39:19 @import
app/frontend/src/stylesheets/bootstrap_and_overrides.scss 1075:9 @import
app/frontend/src/stylesheets/application.scss 2:9 @import
app/frontend/packs/application.scss 18:9 root stylesheet
WARNING: 34 repetitive deprecation warnings omitted.
Je ne sais pas si cela est une cause à effet mais en tout cas, je tombe sur le message d'erreur Web : "We're sorry, but something went wrong."
