Problem activating jetflow plugin

Hello,

When I try to activate the plugin I et the following error:

ERROR: Unable to activate the plugin due to database errors
Index column size too large. The maximum column size is 767 bytes. CREATE TABLE IF NOT EXISTS wp_jstorage ( id bigint(20) unsigned NOT NULL AUTO_INCREMENT, storage_id int(10) unsigned NOT NULL DEFAULT 0, flow_id bigint(20) NOT NULL DEFAULT 0, rec_key varchar(200) NOT NULL, rec_value text NOT NULL COMMENT “Serialized”, col_count int(10) unsigned NOT NULL DEFAULT 0 COMMENT “Number of fields”, user_id bigint(20) NOT NULL DEFAULT 0, ip varchar(39) NOT NULL, create_time bigint(20) NOT NULL DEFAULT 0, update_time bigint(20) NOT NULL DEFAULT 0, PRIMARY KEY (id), KEY flow_record (flow_id,rec_key), KEY storage_record (storage_id,rec_key) ) DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT=”The Storage” AUTO_INCREMENT = 156

Any idea how to solve this?