SecuritySig error!!

[soadmania]

Hi guys.
I downloaded new media.pk2 and used it. That was no problem. Then i closed it and looked for other pk2 s. I tried some of it. I reinstalled ECSRO then changed the pk2. But i cant open ECSRO or Sjsro now. An error appears when i click start. Look the pic:

[_HouseMusicx3]

try the media that i uploaded

[safilisx]

i got same problem like soadmania and i downloaded that mediapk but still same what i need to do ???