error creating new post

Hello,
I was not able to create a new post in my wordpress, I activated the debug and received the following error messages:

Deprecated: Return type of FS_Key_Value_Storage::offsetExists($k) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 309

Deprecated: Return type of FS_Key_Value_Storage::offsetGet($k) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 317

Deprecated: Return type of FS_Key_Value_Storage::offsetSet($k, $v) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 301

Deprecated: Return type of FS_Key_Value_Storage::offsetUnset($k) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 313

Deprecated: Return type of FS_Key_Value_Storage::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 328

Deprecated: Return type of FS_Key_Value_Storage::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 339

Deprecated: Return type of FS_Key_Value_Storage::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 350

Deprecated: Return type of FS_Key_Value_Storage::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 362

Deprecated: Return type of FS_Key_Value_Storage::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 375

Deprecated: Return type of FS_Key_Value_Storage::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/exerciciosweb.com.br/public_html/wp-content/plugins/internal-links/freemius/includes/managers/class-fs-key-value-storage.php on line 389

And the plugin also stopped working. when deactivating the plugin it returned to normal and I was able to create a new post. How could I solve it? I really like the plugin, it helps me a lot with my content.