Error in Jacobian

Can I know what the error means??

"Failed to find consistent initial values.
Segregated group 1

Failed to evaluate operator Jacobian.
Operator: nif, Geometry: 1, Boundary: 12 13 14 15 17 18 19 20 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 81 82 85 86 87 88 90 91 92 93 95 96 97 98 100 101 102 103 105 106 107 108 110 111 112 113 115 116 117 118 120 121 122 123 125 126 127 128 130 131 132 133 135 136 137 138 140 141 142 143 145 146 147 148 150 151 152 153 155 156 157 158 160 161 163 164 166 167 169 170 172 173 174 175 177 178 179 180 182 183 184 185 187 188 189 190 192 193 194 195 197 198 199 200 202 203 204 205 207 208 209 210 212 213 214 215 217 218 219 220 222 223 224 225 227 228 229 230 232 233 234 235 237 238 239 240 242 243 244 245
Last time step is not converged."