Hi,
and attach all relevant logs
I went over the logs, are you sure the export domain was formatted properly? Couldn't find it in the engine.log
Looking at the logs it seems VMs were found on the export domain (id=3a514c90-e574-4282-b1ee-779602e35f24)
2017-11-19 13:18:13,007+0300 INFO (jsonrpc/2) [storage.StorageDomain] vmList=[u'01a4f53e-699e-4ea5-aef4-458638f23ce9', u'03c9e965-710d-4fc8-be06-583abbd1d7a9', u'07dab4f6-d677-4faa-9875-97bd6d601f49', u'0b94a559-b31a-475d-9599-36e0dbea579a', u'13b42f3a-3057-4eb1-ad4b-f4e52f6ff196', u'151a4e75-d67a-4603-8f52-abfb46cb74c1', u'177479f5-2ed8-4b6c-9120-ec067d1a1247', u'18945b31-3ba5-4e54-9bf0-8fdc3a7d7411', u'1e72be16-f540-4cfd-b0e9-52b66220a98b', u'1ec85134-a7b5-46c2-9c6c-eaba340c5ffd', u'20b88cfc-bfae-4983-8d83-ba4e0c7feeb7', u'25fa96d1-6083-4daa-9755-026e632553d9', u'273ffd05-6f93-4e4a-aac9-149360b5f0b4', u'28188426-ae8b-4999-8e31-4c04fbba4dac', u'28e9d5f2-4312-4d0b-9af9-ec1287bae643', u'2b7093dc-5d16-4204-b211-5b3a1d729872', u'32ecfcbb-2678-4f43-8d59-418e03920693', u'3376ef0b-2af5-4a8b-9987-18f28f6bb334', u'34d1150f-7899-44d9-b8cf-1c917822f624', u'383bbfc6-6841-4476-b108-a1878ed9ce43', u'388e372f-b0e8-408f-b21b-0a5c4a84c457', u'39396196-42eb-4a27-9a57-a3e0dad8a361', u'3fc02ca2-7a03-4d5e-bc21-688f138a914f', u'4101ac1e-0582-4ebe-b4fb-c4aed39fadcf', u'44e10588-8047-4734-81b3-6a98c229b637', u'4794ca9c-5abd-4111-b19c-bdfbf7c39c86', u'47a83986-d3b8-4905-b017-090276e967f5', u'49d83471-a312-412e-b791-8ee0badccbb5', u'4b1b9360-a48a-425b-9a2e-19197b167c99', u'4d783e2a-2d81-435a-98c4-f7ed862e166b', u'51976b6e-d93f-477e-a22b-0fa84400ff84', u'56b77077-707c-4949-9ea9-3aca3ea912ec', u'56dc5c41-6caf-435f-8146-6503ea3eaab9', u'5729e036-5f6e-473b-9d1d-f1c4c5c55b2d', u'5873f804-b992-4559-aff5-797f97bfebf7', u'58b7a4ea-d572-4ab4-a4f1-55dddc5dc8e8', u'590d1adb-52e4-4d29-af44-c9aa5d328186', u'5c79f970-6e7b-4996-a2ce-1781c28bff79', u'5feab1f2-9a3d-4870-a0f3-fd97ea3c85c3', u'63749307-4486-4702-ade9-4324f5bfe80c', u'6555ac11-7b20-4074-9d71-f86bc10c01f9', u'66b4b8a0-b53b-40ea-87ab-75f6d9eef728', u'672c4e12-628f-4dcd-a57e-b4ff822a19f3', u'679c0445-512c-4988-8903-64c0c08b5fab', u'6ae337d0-e6a0-489f-82e6-57a85f63176a', u'6d713cb9-993d-4822-a030-ac7591794050', u'72a50ef0-945d-428a-a336-6447c4a70b99', u'751dfefc-9e18-4f26-bed6-db412cdb258c', u'7587db59-e840-41bc-96f3-b212b7b837a4', u'778c969e-1d22-46e3-bdbe-e20e0c5bb967', u'7810dec1-ee1c-4291-93f4-18e9a15fa8e2', u'7a6cfe35-e493-4c04-8fc6-e0bc72efc72d', u'7a7d814e-4586-40d5-9750-8896b00a6490', u'7af76921-4cf2-4c3c-9055-59c24d9e8b08', u'7d781e21-6613-41f4-bcea-8b57417e1211', u'7da51499-d7db-49fd-88f6-bcac30e5dd86', u'850a8041-77a4-4ae3-98f9-8d5f3a5778e6', u'85169fe8-8198-492f-b988-b8e24822fd01', u'87839926-8b84-482b-adec-5d99573edd9e', u'8a7eb414-71fa-4f91-a906-d70f95ccf995', u'8a9a1071-b005-4448-ba3f-c72bd7e0e34b', u'8b73e593-8513-4a8e-b051-ce91765b22bd', u'8cbd5615-4206-4e4a-992d-8705b2f2aac2', u'92e9d966-c552-4cf9-b84a-21dda96f3f81', u'95209226-a9a5-4ada-8eed-a672d58ba72c', u'986ce2a5-9912-4069-bfa9-e28f7a17385d', u'9f6c8d1d-da81-4020-92e5-1c14cf082d2c', u'9ff87197-d089-4b2d-8822-b0d6f6e67292', u'a0a0c756-fbe9-4f8e-b6e9-1f2d58f1d957', u'a46d5615-8d9f-4944-9334-2fca2b53c27e', u'a6a50244-366b-4b7c-b80f-04d7ce2d8912', u'aa6a4de6-cc9e-4d79-a795-98326bbd83db', u'accc0bc3-c501-4f0b-aeeb-6858f7e894fd', u'b09e5783-6765-4514-a5a3-86e5e73b729b', u'b1ecfe29-7563-44a9-b814-0faefac5465b', u'baa542e1-492a-4b1b-9f54-e9566a4fe315', u'bb91f9f5-98df-45b1-b8ca-9f67a92eef03', u'bd11f11e-be3d-4456-917c-f93ba9a19abe', u'bee3587e-50f4-44bc-a199-35b38a19ffc5', u'bf573d58-1f49-48a9-968d-039e0916c973', u'c01d466a-8ad8-4afe-b383-e365deebc6b8', u'c0be5c12-be26-47b7-ad26-3ec2469f1d3f', u'c31f4f53-c22b-40ff-8408-f36f591f55b5', u'c530e339-99bf-48a2-a63a-cfd2a4dba198', u'c8a610c8-72e5-4217-b4d9-130f85db1db7', u'ca0567e1-d445-4875-94b1-85e31f331b87', u'd2c3dab7-eb8c-410e-87c1-3d0139d9903c', u'd330c4b6-bfa0-4061-aa1a-0f016598f2d0', u'd5626b82-5079-4c42-84f5-fd972b493841', u'd740e080-701d-4e07-becb-2b065a27e44b', u'd85ceb8e-410a-4d71-af9f-0ffeac1dbd92', u'd92b3d02-ec66-4431-8cdc-f039d8b7bb12', u'dc8cd6e5-4f0d-4df9-adc6-bede342a1cff', u'df3b363f-b76e-44f0-afe3-1704cb1025e8', u'e38e2e52-d85b-4386-a319-97b625b5483c', u'e6e02885-4f85-4968-a09c-151403811733', u'e751a33c-c7de-4d06-a8dc-ef522f604b75', u'edc862cf-f345-4f2f-ac3b-014a27a8f29f', u'eeb8a3c5-8995-40cb-91c6-3097f7bc8254', u'f2b20f6d-5a6a-4498-b305-db558a22af48', u'f4429fa5-76a2-45a7-ae3e-4d8955d4f1a6', u'f8acf745-eee9-4509-8658-c5e569fbb4ef', u'fb9a7e78-fe58-4f79-a4e9-ee574200207f', u'fdf5f646-b25c-4000-8984-5e90a5b2c034'] (sd:906)
f4429fa5-76a2-45a7-ae3e-4d8955d4f1a6 - the offending VM is there. Can you see if there's anything in the directory? The path should be something like /rhev/data-center/mnt/...../3a514c90-e574-4282-b1ee-779602e35f24/master/vms/f4429fa5-76a2-45a7-ae3e-4d8955d4f1a6
You can try and remove it manually.