Hello,
You need to open the RFM file for that series and look to see if ers is enabled.
Go to the root directory for the game, and open the RFM folder. Look for the .rfm file of the same name as your series. In my case, I have F1 2012 WCP, and my file is named F1_2012_WCP.RFM. Open the file with notepad and scroll down looking for the ers entries. In my case, it looks like this...
[RF_HIGHVOLTAGE1]
// Min required version of rF_HighVoltage (-1 = Force latest available version)
MIN VERSION REQUIRED = 1.3.0.0
// KERS enabled in this mod? 0 (or missing) = disabled / 1 = enabled
KERS ENABLED = 1
// How long is KERS available (time in seconds)
KERS TIME = 6.6
// 0 kers can't be refilled / 1 = refill at Start/Finish line
KERS REFILLABLE = 1
// how often can kers be refilled
KERS NUM USAGE PER FILL = -1
// This setting enables you the adapt the strengt of the kers effect to the needs of your mod (100 = 100%) (min. 0 (off) / max. 200 (doubles the default setting)
KERS POWER FACTOR = 150
Check that Kers is enabled = 1 and the other entries are there like the example. The mod could be a problem, or the RFM may not be complete. The track also needs to be designed for it.
Not something I have ever used, but we will try to help