Hello!!
I am suddenly and repeatedly getting this error, I have tried everything.

any thoughts on how to fix??
TY in advance

Model: MacPro3,1, BootROM MP31.006C.B05, 8 processors, Quad-Core Intel Xeon, 2.8 GHz, 24 GB, SMC 1.25f4
Graphics: ATI Radeon HD 2600 XT, ATI Radeon HD 2600, PCIe, 256 MB
Memory Module: DIMM Riser B/DIMM 1, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Memory Module: DIMM Riser B/DIMM 2, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Memory Module: DIMM Riser A/DIMM 1, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Memory Module: DIMM Riser A/DIMM 2, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Memory Module: DIMM Riser A/DIMM 3, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Memory Module: DIMM Riser A/DIMM 4, 4 GB, DDR2 FB-DIMM, 800 MHz, 0x802C, 0x333648544635313237324638304545314434
Bluetooth: Version 4.0.8f17, 2 service, 11 devices, 1 incoming serial ports
Network Service: 802.11n NIC, Ethernet, en3
PCI Card: ATI Radeon HD 2600, sppci_displaycontroller, Slot-1
Serial ATA Device: Hitachi HDE721064SLA360, 640.14 GB
Serial ATA Device: ST3500630AS P, 500.11 GB
Serial ATA Device: Samsung SSD 850 PRO 256GB, 256.06 GB
Serial ATA Device: ST3500418AS, 500.11 GB
Parallel ATA Device: PIONEER DVD-RW  DVR-112D
USB Device: 802.11n NIC, 0x0bda  (Realtek Semiconductor Corp.), 0x8812, 0xfd300000 / 2
USB Device: Hub in Apple Extended USB Keyboard, apple_vendor_id, 0x1002, 0x3d200000 / 2
USB Device: Apple Extended USB Keyboard, apple_vendor_id, 0x0204, 0x3d210000 / 3
USB Device: USB Receiver, 0x046d  (Logitech Inc.), 0xc534, 0x1d100000 / 2
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8206, 0x5d200000 / 3
USB Device: iLok, 0x088e, 0x5036, 0x5d100000 / 2
FireWire Device: built-in_hub, 800mbit_speed
FireWire Device: Fireface UFX, RME!, 400mbit_speed