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Bunch of warnings show up if you have debug enabled for wordpress:
Deprecated: Return type of FS_Key_Value_Storage::offsetExists($k) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/freemius/includes/managers/class-fs-key-value-storage.php on line 309
Deprecated: Return type of FS_Key_Value_Storage::offsetGet($k) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/freemius/includes/managers/class-fs-key-value-storage.php on line 317
Deprecated: Return type of FS_Key_Value_Storage::offsetSet($k, $v) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/freemius/includes/managers/class-fs-key-value-storage.php on line 301
Deprecated: Return type of FS_Key_Value_Storage::offsetUnset($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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/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/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/freemius/includes/managers/class-fs-key-value-storage.php on line 389
Deprecated: Optional parameter $message declared before required parameter $args is implicitly treated as a required parameter in /home/a2076/public_html/xxx/wp-content/plugins/wp-twilio-core/helpers.php on line 109