Inconsistent Code Parser Error messages

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It would be expected that the following codes, which have an erroneously written immediate value, have all the same type of error message.

1
   ADDI R0 R0 #0x0

1
   ADDI R0 R0 #0.0

1
   ADDI R0 R0 #(0)

1
   ADDI R0 R0 0

Instead, there are 3 types of error messages that are thrown:

• Unknown opcode x0
• Unable to tokenize the rest of the input: ...
• Invalid instruction format for ADDI. Expected GeneralRegisterAndInmediate format, got Noop format or similar

Ideally, it should be only one error message, clearly indicating that the immediate value has a wrong format. Arguably, the worst one is the invalid instruction format, that unfortunately seems very common.

Also, this issue is intended for collecting feedbacks of other unclear messages and possible solutions.