Error: UNRESOLVED EXTERNAL SYMBOL and REFERENCE MADE TO UNRESOLVED EXTERNAL

Hello everyone, I am using Keil uVision2 to write my assembler code. I am always getting the same error. I searhed on Google and everbody says the solution is in the Keil manual but I could not find...
Error: UNRESOLVED EXTERNAL SYMBOL and REFERENCE MADE TO UNRESOLVED EXTERNAL

Hello everyone, I am using Keil uVision2 to write my assembler code. I am always getting the same error. I searhed on Google and everbody says the solution is in the Keil manual but I could not find...
ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: ?C?LIMUL

I just ordered the PK51 tool chain. Installed it and tried to compile some code on an old project. The files appear to compile, but the linking step is throwing the error shown below. I searched...
Linker Error L118: Reference made to erroneous external.

I need help. I don't know what this means. It's probably really easy so go easy on me.
Linker Error L118: Reference made to erroneous external.

I need help. I don't know what this means. It's probably really easy so go easy on me.