I'm planning on building a guitar amp and i wanted to simulate the circuit but i have these errors i can't get rid off: Here is my project : [https://easyeda.com/alassaneg/guitar-amp](https://easyeda.com/alassaneg/guitar-amp) I don't have issues anymore when i remove "VolPROBE5". Circuit: gooduntitled Error on line 4 : v4 0 xu1_4 5 dc 1 0    unknown parameter (0) Error on line 9 : r3 0 r3_2 volprobe3    unknown parameter (volprobe3) errors/warnings in your design, please fix them if you need errors/warnings in your design, please fix them if you need. Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Warning: r3: resistance to low, set to 1 mOhm Warning: v1: no DC value, transient time 0 value used Initial Transient Solution \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Node                                   Voltage \-\-\-\-                                   \-\-\-\-\-\-\- xu1_1                                        5 xu1_4                                       -5 v1_1                                         1 xu1_3                                        0 xu1_9                                        0 r5_2                                         0 r3_2                                         0 xu1_10                                       0 volprobe4                                    0 v1#branch                                    0 v4#branch                                    0 v5#branch                                    0 No. of Data Rows : 738 Error(parse.c--checkvalid): volprobe3: no such vector. ngspice-26 done If someone could help with that, it would help me a lot. Thank you.