【React】これ。Warning: flattenChildren(…): Encountered two children with the same key, `keyName`. Child keys must be unique; when two children share a key, only the first child will be used.

1536 × 140 【React】これ。Warning: flattenChildren(…): Encountered two children with the same key, `keyName`. Child keys must be unique; when two children share a key, only the first child will be used.
【React】これ。Warning: flattenChildren(...): Encountered two children with the same key, `keyName`. Child keys must be unique; when two children share a key, only the first child will be used.

【React】これ。Warning: flattenChildren(…): Encountered two children with the same key, `keyName`. Child keys must be unique; when two children share a key, only the first child will be used.

【React】これ。Warning: flattenChildren(...): Encountered two children with the same key, `keyName`. Child keys must be unique; when two children share a key, only the first child will be used.