在运行时rake db:migrate我收到此错误消息:
rake aborted!
ActiveRecord::StatementInvalid: SQLite3::ReadOnlyException: attempt to write a readonly database: CREATE TABLE "schema_migrations" ("version" varchar NOT NULL PRIMARY KEY)
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/statement.rb:108:in `step'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/statement.rb:108:in `block in each'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/statement.rb:107:in `loop'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/statement.rb:107:in `each'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:152:in `map'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:152:in `block in execute'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:95:in `prepare'
/var/lib/gems/2.3.0/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:in `execute'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:255:in `block (2 levels) in execute'
/var/lib/gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
/var/lib/gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
/var/lib/gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:254:in `block in execute'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract_adapter.rb:579:in `block (2 levels) in log'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract_adapter.rb:578:in `block in log'
/var/lib/gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract_adapter.rb:569:in `log'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:253:in `execute'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:311:in `create_table'
/var/lib/gems/2.3.0/gems/activerecord-5.2.0/lib/active_record/schema_migration.rb:29:in …