First, you will need to reduce the size of your screenshot to a maximum of 800x600, in line with forum rules. Secondly, use of text-speak ("4" instaed of "for") is also not allowed.
Right - now we've got the formalities out of the way, let's deal with the problem - as far as I recall, this error message is often caused by having too many consists for your MSTS installation to cope with. Are you using TrainStore? If not, that should cure the problem (if I'm right about the cause...)
Ashley
Ashley Gray
Intel Core i7-7700K @ 4.2Ghz Quad Core, Gigabyte Gaming Motherboard, 2 x 512Gb SSDs + 1TB SATA drives,
16 Gb DDR-4 Corsair RAM, Nvidia GeForce GTX1060 6Gb RAM, ASUS Xonar D2X/XDT Soundcard, Windows 10 64 bit